Great Central Models Robinson GCR Class 8B Atlantic LNER C4 Assembly Instruction Manual
Page 1 GCR Class 8B
Page 1 GCR Class 8B
Great Central Models
Robinson GCR Class 8B Atlantic
(LNER C4)
Version 1.2 February 2013
Assembly Instructions Revised July 2014
Catalogue #GCM005
This kit is optimised for P4 and EM standards. The kit was designed by “Great Central Models” as part of an
expanding range of Great Central Railway locomotives.
Great Central Models Ltd is registered as a Private Limited Company - 7355519
Further details - www.greatcentralmodels.co.uk
Enquiries to sales@greatcentralmodels.co.uk or via the contacts page on the web site
The picture above is for illustration only, it is actually a 7 mm model painted and finished by a very well known artist, whose
writings on the subject are well worth reading. Also worthy of note is the newly released book by John Quick, “Robinson’s
Locomotive Liveries on the Great Central Railway”.
Page 2 GCR Class 8B
Page 2 GCR Class 8B
Robinson GCR Class 8B LNER C4
The Class 8B was a trial build of a 4-4-2 soon after Robinson decided on a big engine policy. While impressed by the work done
by Churchward at Swindon, he seems to have adopted a cautious approach so decided to build 4 locomotives, essentially with
all the major features the same, but the Class 8C as a 4-6-0 and the Class 8B as a 4-4-2 Atlantic. 6’ 9” coupled wheels were fitted.
The work was done by Beyer Peacock and was based on the earlier 4-6-0s, the so-called “fish” engines which were Class 8 under
the Great Central way of categorising locomotives.
In principle, the rear end of the Class 8B was designed so that it could be converted easily to the Class 8C but it was the ‘Atlantic’
design that prevailed.
All were built between 1903 and 1906 by Beyer-Peacock (7), North British Loco. Co. (12), and at Gorton (8) with saturated steam
boilers. The only difference was really the fire grate, in the first build it was rather shallow, matching the Class 8C. Once the
decision had been made to stick with the 8B design rather than the 8C, a deeper fire box was fitted. They were withdrawn over
a period from 1939 until 1950, having been replaced by the B17s, but mainly during 1948-1950. None of them received BR
numbers, their replacement meant that none were re-painted or re-numbered.
Superheating was started in 1912 and continued right up to 1936 - no rush then!
As with the other Robinson locomotives, chimneys were a varying feature. The classical GCR chimneys were not approved by the
LNER because of the loading gauge issues (in common with most of the GCR classes) so were replaced initially by the LNER
flower-pot version. Later a pseudo-GCR chimney was fitted. Use the “13 ft Gauge” column below as a guide to when this
happened, generally it was a lot later than other Robinson classes. Flattened or angular domes were used at various times, the
angular domes seemed to appear during WW 2. The movement of the whistle from the cab top onto the boiler happened for
the same reasons of loading gauge As always, a good picture is the best guide, provided the dating is accurate!
For guidance, according to RCTS data and Yeadon Vol 13:-
Manufacturer Built Withdrawn GCR # Superheated LNER 1924 LNER 1946 13 ft Gauge
Beyer, Peacock 12/1903 11/1950 192 9/1920 5192 (10/1925) 2900 (8/1946) 5/1937
Beyer, Peacock 12/1903 11/1950 194 10/1925 5194 (10/1925) 2901 (6/1946) 1/1938
Beyer, Peacock 7/1904 4/1949 263 6/1926 5263 (4/1924) 2902 (6/1946) 8/1938
Beyer, Peacock 7/1904 6/1949 264 7/1921 5264 (2/1924) 2903 (9/1946) 9/1937
Beyer, Peacock 7/1904 12/1947 265 9/1920 5265 (1/1925) 2904 (8/1946) 5/1937
Beyer, Peacock 7/1904 10/1943 266 5/1921 5266 (5/1922) 2905 5/1938
Beyer, Peacock 7/1904 11/1947 267 9/1920 5267 (2/1925) 2906 (3/1946) 3/1939
N.B. Loco. Co 10/1905 12/1947 1083 1/1921 6083 (9/1924) 2907 (6/1946) 4/1937
N.B. Loco. Co 10/1905 11/1950 1084 8/1929 6084 (7/1925) 2908 (6/1946) 7/1937
N.B. Loco. Co 10/1905 11/1950 1085 1/1925 6085 (1/1925) 2909 (6/1946) 1/1925
N.B. Loco. Co 10/1905 2/1949 1086 8/1914 6086 (2/1924) 2910 (6/1946) 10/1937
N.B. Loco. Co 10/1905 11/1944 1087 9/1920 6087 (12/1925) 2911 11/1937
N.B. Loco. Co 10/1905 8/1949 1088 12/1926 6088 (11/1924) 2912 (9/1946) 12/1936
N.B. Loco. Co 11/1905 4/1947 1089 6/1920 6089 (10/1924) 2913 (11/1946) 10/1937
N.B. Loco. Co 11/1905 11/1939 1090 3/1914 6090 (10/1924) 8/1936
N.B. Loco. Co 11/1905 3/1948 1091 4/1925 6091 (4/1925) 2914 (6/1946) 9/1937
N.B. Loco. Co 11/1905 6/1949 1092 3/1921 6092 (7/1925) 2915 (10/1946) 8/1936
N.B. Loco. Co 11/1905 11/1948 1093 11/1927 6093 (9/1925) 2916 (9/1946) 6/1937
N.B. Loco. Co 11/1905 5/1949 1094 1/1936 6094 (2/1924) 2917 (8/1946) 7/1937
Gorton 2/1906 12/1950 260 2/1935 5260 (12/1925) 2918 (8/1946) 5/1938
Gorton 3/1906 11/1950 261 1/1927 5261 (12/1925) 2919 (8/1946) 2/1937
Gorton 4/1906 2/1948 262 4/1925 5262 (12/1925) 2920 (8/1946) 1/1937
Gorton 5/1906 4/1948 358 5/1920 5358 (12/1925) 2921 (8/1946) 3/1937
Gorton 6/1906 6/1948 360 10/1920 5360 (12/1925) 2922 (8/1946) 12/1936
Gorton 7/1906 2/1949 361 3/1912 5361 (12/1925) 2923 (8/1946) 10/1937
Gorton 6/1906 1/1948 362 3/1928 5362 (12/1925) 2924 (8/1946) 3/1937
Gorton 8/1906 4/1949 363 2/1921 5363 (12/1925) 2925 (8/1946) 2/1937
Page 3 GCR Class 8B
Page 3 GCR Class 8B
Additional Notes
LNER Numbering - there were huge variations in how LNER numbering was applied. Sizes varied, location carried, style varied,
sometimes just ‘NE’, sometimes still with the GCR cab side plate and the letter ‘c’ added to the LNER number, sometimes on the
tender but mainly on the cab once the LNER got themselves sorted out.
Photographs should be consulted when deciding what number to have. Of course in GCR days it was all rather simpler.
Locomotives could have a carriage heater connection at the front as they became used on passenger trips which would mean
that a heating pipe should also be added to the tender.
Smoke box handles - for this class the wheel arrangement was kept throughout their lifetime.
There are more versions of the chimneys and domes than catered for by the kit. The original chimney was of a much finer
appearance and rapidly failed in service.
Ramsbottom 2 column valves were originally fitted and a branching arrangement used for the traditional 4-column appearance.
These were originally uncased but casing was added later. Ross valves replaced the Ramsbottom valves during superheating.
Tail rods on the cylinders were removed before grouping but I have no dates for this, it seemed to happen over a longer period
than other GCR classes, but before grouping. On super-heating a ‘snifting’ valve was fitted behind the chimney. At the same
time the ash ejector was fitted on the right of the Smoke Box.
Centre steps were removed before the grouping, at speed they could ‘whip’ and potentially hit the connecting rod.
Livery was perplexing. Originally in full GCR green regalia, they soon reverted to lined black and then the LNER painted them
green again until WW 2, when they all became black again. Under LNER management, the beading was always unpainted and
usually unpolished.
Tenders when built for 192, 194 were the GCR 3,250 gallon version but these were soon replaced by the group standard with
plated sides.
As with all models from this era, the best thing a modeller can do is refer to published literature such as
Ÿ “Locomotives of the LNER Part 3A” from RCTS
Ÿ “Locomotives of the Great Central Railway” by E. M. Johnson
Ÿ Photographs from various collections - usually available at shows such as Scaleforum and Scalefour North
Ÿ “Yeadon’s Register of LNER Locomotives - Part 13”
These locomotives, known as the “Jersey Lilies” ranged far and wide and could be seen as far away from GCR rails as Plymouth
and Weston-Super-Mare, even running a slip coach at one stage. They ended their days doing light duties on the BR Eastern
Region. Their visits to Plymouth are a good excuse to put a “Green, with rivets”, next to a GCR Class 8B, “Green, without rivets”
Important Note
This kit has been designed for P4 or EM standards. Alternative parts have been designed into the brass and nickel silver frets.
There are plenty of spare parts for the smaller items. Considerable additional work will be needed to build this kit to ‘00’
standards. Remember that ‘00’ and EM wheels will cut into the boiler space. For EM modellers care must be taken not to
increase the upward movement of the wheels if sprung or compensated by filing out the axle slots in the frames. If the kit, when
built, has a lot of side play then even the P4 version will find the wheels hitting the boiler. In all cases the boiler can be ground
out to clear this.
Notes on the kits and constituent parts
The etched parts in this kit have been designed using a CAD program (TurboCAD 18.2) to ensure accuracy when fitting the parts
together. Included in these notes are:-
Ÿ A list of etched and cast parts
Ÿ A list of additional and optional parts
Ÿ Drawings of the etch fret
Page 4 GCR Class 8B
Page 4 GCR Class 8B
Ÿ Detailed step-by-step instructions with the drawings extracted from the CAD originals
The original CAD drawings were prepared from GA drawings obtained from MOSI in Manchester and scaled at 12” to 1’. During
the design process a number of compromises had to be made (such as the frame widths) because of the materials and parts
available to the modeller and the P4 and EM standards. These compromises were used to draw a full size CAD drawing which
was then used to provide the instructions and construction drawings and the final etch parts. The etch parts of the drawing
were scaled down very accurately to produce etches for the 4 mm modeller.
The kit prototypes were built by the designer. The first trial etch was used as a feasibility project and to write outline
instructions. The second test etch was used to test the assembly, write instructions and produce the assembly diagrams as well
as a viable model. A modeller familiar with etch brass kit construction should be able to build an accurate model if these
instructions are followed, generally as written. However, fine-scale modellers being who we are, other ways of building the kit
will be tried!
The Instructions
More years ago than I care to remember I was involved in validating and writing Master Work Sheets for the Royal Air Force.
These were sets of instructions that had to be followed to the letter by technicians world-wide even though they may never
have met that particular piece of equipment before. Deviations were never permitted to the technicians – given that the
machines being tested were vital to safe flying – and any permission to be deviant granted by senior authority was subject to a
very close monitoring process.
However, senility and pending obsolescence have taken their toll – nobody is perfect – so if you find anything in these
instructions you feel to be wrong it will be examined closely and amended where appropriate. Likewise, with the measurements
of the parts, if there is something which you feel may be wrong then, please let me know. It would be nice if this was supported
by drawings, or copies of drawings with time stamps if possible. Photographs are useful as well. But be warned, the available
drawings are neither consistent nor accurate if my research means anything at all and there were so many cosmetic changes
made to these locomotives over nearly 50 years that photographs without a date stamp must be treated with some caution.
Things to note
In a few areas there are alternative ways of doing things. While there are traditional etched springs on Sheet 3, for this kit the
centre springs have been printed using 3D CAD technology. They are fitted to the horn blocks. Note that these are heat sensitive
and will melt as quickly as white metal castings. The etched or printed springs mean that the wheels can also be removed for
‘servicing’.
Continuous Springy Beams (CSBs) may be fitted - they seem to be all the vogue these days. I am a little uncomfortable with the
idea for a complex wheelbase such as a 4-4-2 and prefer to stick with the prototype idea where each axle is sprung by itself.
Short handrail knobs are used for the spring mounts. EM and ‘00’ modellers may use frame blanks to remove the need for
springing.
Stephenson’s Valve Gear would have been visible only by looking very carefully, for this engine. Extra parts are provided so you
can experiment with the way it fits together. If you are tempted to try this then please do remember not to solder the parts in
situ ‘after’ you have fitted your plastic centred wheels. The valve gear may be fitted in working order or as a very loose fit on the
centre axle. In the second case they will be visible but will not move except around the axis of the axle.
The Stephenson’s Valve Gear is tricky to get working well and may be left out. The rest of the engine will still look good when
finished and painted.
The builder will find an array of brake parts on the fret. While 3D brakes are an option and remove the possibility of shorts while
fitting closely to the wheels, they are vulnerable to handling errors. However, there are ways to strengthen them with the etch
base parts, or the builder may use etch parts only.
Rear and centre frame spacers - those supplied on the etch are to scale and may be fitted if desired - you can create frame
spacers which are a good representation of the originals with their strengthening brackets but these are difficult to see when
the model is completed. In practice the rear spacer construction was used to steady the front of the fire box but this may be
omitted without weakening the whole chassis. P4 and EM versions of these spacers are supplied together with some generic
spares. These are not standard widths though. Use the spares in appropriate places if you do not need the scale spacers or wish
to add your own parts for additional electrical pick-up.
There is substantial current collection capability in the tender. I was persuaded not to have pick-ups in the locomotive since they
would detract from the scale frame spacers and the valve gear and since there is plenty of space in the tender with or without
the optional DCC chip this may be a good option. The two wires for the motor may then represent the vacuum and heating
pipes.
Page 5 GCR Class 8B
Page 5 GCR Class 8B
The part numbers and descriptions (where space permits) are half etched on the frets as near to the parts as sensible and match
the description that appears in the Parts List. These annotations will appear in the form “212”, or “223,224” or 213-217” or 218225+3”. Where something like “212EM” appears on the fret then that is the EM version of a part that will also have a P4
(unlabelled) part on the fret. Where the “+” appears in the part number it shows that additional parts have been included and
the number following shows that 3 additional parts are on the fret. This allows for two possibilities
a) losing very small parts in the carpet after cutting them from the fret
b) practising the assembly in cases where some difficulty may be expected
Also on the fret there are a couple of blocks on which to practice your skill at pushing out rivets. Try these first to test the
consistency of your efforts. Refer to photographs to check if these parts were actually riveted early in life, Robinson abhorred
‘proud’ rivets and there is some photographic evidence to show that they may not have been used in the early days, even at the
bottom of the smoke box.
The instructions also use the Part Number and Full Description. This may seem a little pedantic but can help where there may be
some uncertainty. I also list all parts separately and do not group sets of parts together (i.e. Springs Qty 7) so that you will find
the parts list will show each layer in a built up assembly as an individual item.
Assembly Instructions
You may also find it easier to drill out all the locating holes while the parts are still within the main etch, and even to assemble
some of the parts together - simply because this helps to hold at least one of the parts firmly in place.
Do not use force at any time, you are likely to bend the parts beyond repair. The tabs and slots are designed to be a semi-tight
fit and on occasion a little easing with a strip of wet & dry sandpaper may be needed, especially on the slots in the smaller parts.
If needed, where parts fit into a slot, very lightly dress the mating edges with a fine file. Most slots are 2 mm long and the edge
strips on the etches may be used to ease them out a little if needed.
Unless otherwise stated, the folds are all done with the half etch on the inside.
TAGS are on the fret and hold the individual parts in place when the fret is etched. TABS are on the parts to fit into SLOTS in the
corresponding parts. In many areas on the fret TAGS have been arranged so that they fit onto TABS solely to help minimize any
possible damage to the component when the TAGS are removed since the TABS will all in the end be invisible.
Do not confuse TAGS and TABS and file off any TABS!
It may be easier to do a number of preparatory jobs before removing parts from the main etches. There are a few rivets that
may have to be pushed through from the rear of some parts, such as the main frames. The smoke box wrapper was flush riveted
when built but as the LNER super-heated the locomotives they would normally have been replaced by the usual, highly visible
rivets. Front buffers sometimes had rivets added after superheating but not necessarily at the same time. The smoke box
wrapper may also have had further rivets added as well as the smoke box front around the door, which seemed to have
happened in the late 1930s and early 1940s.
As always, if you are really keen on authenticity then the best thing to do is to examine a photograph of the engine you are
modelling.
Decision time
The kit has been designed to use frame spacers that approximate to the frames on the original engines, which means that
stiffeners are also added to the inside and outside of the frames. Should you decide that adding these scale spacers is a step too
far since they will be almost invisible then alternative spacers are included for P4 and EM. Or the builder may decide to provide
his own set of spacers, especially if there are concerns about side play for small radii curves.
Cosmetic spring mechanisms are provided. These are removable using screws for those of us who like to be able to remove the
wheel sets easily.
Sufficient parts are included to make this kit to either P4 or EM standards. Because the EM wheel back-to-back is a little smaller
than P4, the spacers for EM are narrower and the frames will not have the distinctive kink at 4’ 0” from the front of the frame.
Do not mix up the P4 and EM parts since you will find there a world of pain. Remember that EM parts are identified on the fret
with a suffix ‘EM’ after the Part Number.
The kit as designed will go around a 1250 mm radius curve before the bogie wheels hit the frames. A tighter turning circle will
mean that the bogie frames have to be cut back to allow the bogie wheels further side play and they are half-etched on the
inside as a guide. Note also that for something like a 1000 mm radius that the rear inside of the cylinders will need trimming.
Page 6 GCR Class 8B
Page 6 GCR Class 8B
Soldering
I use ‘Nealetin’, a liquid solder with its own flux. This allows very close control of the initial solder join. Most initial joints will be
secure using this (or a similar liquid solder). Motion parts should be soldered with a higher temperature solder. Once you are
convinced things are square then it is possible to run a small fillet of solder along critical joins by first priming with a little
‘Nealetin’.
I have never used lead free solder for making models.
Square Frames
There are a couple of mechanisms, neither of which I have used, which have been acclaimed for the ease with which they
permit a square frame to be built. While these are expensive to start, many modellers have sung their praises.
Under Etched parts
On occasion some parts may be a little under etched. The individual frets have outer frames which are the same width as the
vast majority of the slots (2 mm) - just use a short section of this to free up any dubious slots. In any event it is always wise to
prepare parts using a very fine file to remove any bits of ‘cusp’ left from the etching process, before assembly.
Health & Safety
Experienced modellers will know all this already but -
Ÿ The frets are made from 12’ brass and 15’ nickel silver. They are fragile and the edges are sharp. Take care when assembling
and especially when drilling out holes. Rotating brass (which tends to grab drill bits, especially near the end of their cut) or
nickel silver will cause a lot of skin and tissue damage if the drill sticks and tears. For preference use a hand drill or pin
chuck.
Ÿ Soldering entails the use of toxic materials such as lead and acid flux. Observe the warning notices that come with these
products and especially use adequate ventilation. Wear suitable eye protection where needed.
Ÿ Solder also gets very hot when melted, as do the parts when heated to solder them together. Take care to hold parts
carefully with insulating material where needed and to let them cool properly before handling. This is especially true if
annealing parts so they can be bent into shape more easily. It is also true where several layers may have been used to build
up an assembly.
Ÿ When painting, ensure proper ventilation, especially if using a two part etch solution. Some of these carry hazardous
chemicals.
Ÿ On a few occasions there will be a wire across the frames or bogie soldered at both ends. Do not be tempted to cut this
after assembly with the normal wire cutters, this will force the frames apart and cause some damage. Use something like a
triangular file or a disc cutter to make the first cut!
Note on bending parts with half etched lines
Tighter bends may be achieved as follows if thought to be necessary (notes extracted from some thoughts by Will Litchfield).
1. Deepen the fold line with a triangular 4 cut needle file till a witness line shows though to the other side.
2. Hold the etch on a flat surface with a your trusty steel rule along the fold line.
3. Run a craft knife blade along under the etch to start the fold on it way.
4. When the edge stands well way from the flat surface, use another steel rule to complete the fold.
You get a sharper bend this way, because a of step 1 and it is accurately placed on the centre of the fold line.
Notes on wheel choices
The frames on this kit are set to a design width of 16.15 mm for P4 so that with cusp removal on the spacers approximately
16.00 mm is the final frame width. This is slightly less than some kits, but more than other kits, especially those which were
designed for the ‘00’ market and then had options added for the finer scale gauges of ‘P4’ and ‘EM’. To this width must be
added the outer flange of the horn blocks, which will vary depending on horn block supplied - the ones supplied are from
Markits.
For the fine scale gauges, side play can be an important issue especially where small radius curves of less than 1200 mm are to
be tackled.
Page 7 GCR Class 8B
Page 7 GCR Class 8B
There are three wheel sets available, from Alan Gibson, Ultrascale and Exactoscale. For P4, the Alan Gibson wheels have a rear
boss which is 0.5 mm deep. This will impact side play, especially for P4 modellers and less so for EM modellers. This rear boss
should be removed from Alan Gibson wheels.
Potential purchasers in the fine scale gauges are urged to consider these points. There are, as always, strategies to ameliorate
such issues. Further reading on these points are in :-
Side Play Supplementary Notes
Design Notes
Both of which are available on the web site at www.greatcentralmodels.co.uk on the ‘instructions’ page.
Page 8 GCR Class 8B
Page 8 GCR Class 8B
Locomotive Chassis
0.015’ 0.375 mm Nickel Silver
Locomotive Frame
1. Frame Left - Sheet 1
2. Frame Right - Sheet 1
3. Front Buffer Beam - Sheet 1
4. Front Buffer Beam Overlay - Sheet 1
5. Rear Buffer Beam - Sheet 1
6. Rear Buffer Beam Overlay - Sheet 1
7. Cylinder Spacer Front - Sheet 1
8. Cylinder Spacer Rear - Sheet 1
9. Cab Base Support - Sheet 3
10. Firebox Base - Sheet 3
11. Smoke Box Base - Sheet 3
12. Rear Frame Spacer - Sheet 3
13. Rear Frame Spacer Brace - Sheet 3
14. Rear Frame Spacer Stiffener Left - Sheet 1
15. Rear Frame Spacer Stiffener Right - Sheet 1
16. Centre Frame Spacer - Sheet 3
17. Centre Frame Spacer Stiffener Left - Sheet 1
18. Centre Frame Spacer Stiffener Right - Sheet 1
19. Valve Guide Support Spacer - Sheet 3
20. Valve Guide Support Spacer Stiffener Left Sheet 1
21. Valve Guide Support Spacer Stiffener Right Sheet 1
22. Slide Bar Support Left - Sheet 3
23. Slide Bar Support Right - Sheet 3
24. Buffer Support Left - Sheet 1
25. Buffer Support Right - Sheet 1
26. Sandbox Left - Sheet 1
27. Sandbox Right - Sheet 1
28. Brake Cylinder Support Left - Sheet 1
29. Brake Cylinder Support Right - Sheet 1
30. Guard Iron Left - Sheet 1
31. Guard Iron Right - Sheet 1
32. Buffer Mount - Sheet 1
33. Buffer Mount - Sheet 1
34. Coupler - Sheet 1
35. Coupler - Sheet 1
36. Rear Buffer Housing Plate - Sheet 1
37. Rear Buffer Housing Plate - Sheet 1
38. Footplate Fixing Bracket - Sheet 2
39. Front Buffer Beam Draw Bar Plate - Sheet 1
40. Front Buffer Beam Draw Bar Plate - Sheet 1
41. Rear Buffer Beam Draw Bar Plate - Sheet 1
42. Fire Box Brace - Sheet 1
43. Drag Link - Sheet 1
44. Drag Link - Sheet 1
45. Drag Link - Sheet 1
46. Firebox Right - Sheet 1
47. Firebox Left - Sheet 1
48. Bogie Mount - Sheet 3
49. Cylinder Head - Sheet 3
50. Cylinder Head - Sheet 3
51. Cylinder Head - Sheet 3
52. Cylinder Head - Sheet 3
53. Safety Loop - Sheet 1
54. Safety Loop - Sheet 1
Brakes
55. Brake Frame Mount - Sheet 1
56. Brake Frame Mount - Sheet 1
57. Brake Frame Mount - Sheet 1
58. Brake Frame Mount - Sheet 1
59. Brake Frame Mount - Sheet 1
60. Brake Frame Mount - Sheet 1
61. Brake Pull - Sheet 3
62. Spare
63. Spare
64. Brake Pull Centre Bracket - Sheet 3
65. Brake Pull Centre Bracket - Sheet 3
66. Brake Pull Front Bracket - Sheet 3
67. Brake Pull Front Bracket - Sheet 3
68. Vacuum Cylinder Link - Sheet 3
69. Brake Mount - Sheet 3
70. Brake Mount - Sheet 3
71. Brake Mount - Sheet 3
72. Brake Mount - Sheet 3
73. Rear Wheel Brake Mount - Sheet 3
74. Rear Wheel Brake Mount - Sheet 3
75. Brake Mount Top Layer - Sheet 3
76. Brake Mount Top Layer - Sheet 3
77. Brake Mount Top Layer - Sheet 3
78. Brake Mount Top Layer - Sheet 3
79. Rear Wheel Brake Mount Top Layer - Sheet 3
80. Rear Wheel Brake Mount Top Layer - Sheet 3
81. Brake Shoe Base - Sheet 3
82. Brake Shoe Base - Sheet 3
83. Brake Shoe Base - Sheet 3
84. Brake Shoe Base - Sheet 3
85. Rear Wheel Brake Shoe Base - Sheet 3
86. Rear Wheel Brake Shoe Base - Sheet 3
87. Brake Shoe Top Layer - Sheet 3
88. Brake Shoe Top Layer - Sheet 3
89. Brake Shoe Top Layer - Sheet 3
90. Brake Shoe Top Layer - Sheet 3
91. Rear Wheel Brake Shoe Top Layer - Sheet 3
92. Rear Wheel Brake Shoe Top Layer - Sheet 3
93. Brake Cylinder Link - Sheet 3
94. Brake Cylinder Link - Sheet 3
95. Rear Brake Pull - Sheet 3
96. Spare
97. Rear Brake Pull Tag - Sheet 3
98. Rear Brake Pull Tag - Sheet 3
99. Small Brake Pull - Sheet 3
100. Small Brake Pull - Sheet 3
101. Actuator to Brake Lever - Sheet 3
102. Actuator to Brake Lever - Sheet 3
103. Brake Lever - Sheet 3
104. Brake Lever - Sheet 3
Coupling Rods
105. Coupling Rod Left Front - Sheet 2
106. Coupling Rod Left Front Overlay - Sheet 2
107. Coupling Rod Left Boss Front - Sheet 2
108. Coupling Rod Left Boss Front - Sheet 2
109. Coupling Rod Left Boss Front - Sheet 2
110. Coupling Rod Left Boss Front - Sheet 2
111. Coupling Rod Right Front - Sheet 2
112. Coupling Rod Right Front Overlay - Sheet 2
Page 9 GCR Class 8B
Page 9 GCR Class 8B
113. Coupling Rod Right Boss Front - Sheet 2
114. Coupling Rod Right Boss Front - Sheet 2
115. Coupling Rod Right Boss Front - Sheet 2
116. Coupling Rod Right Boss Front - Sheet 2
Connecting Rods
117. Connecting Rod Left - Sheet 2
118. Connecting Rod Left Overlay - Sheet 2
119. Connecting Rod Right - Sheet 2
120. Connecting Rod Right Overlay - Sheet 2
121. Connecting Rod End Overlay - Sheet 2
122. Connecting Rod End Overlay - Sheet 2
123. Connecting Rod End Overlay - Sheet 2
124. Connecting Rod End Overlay - Sheet 2
Slide Bars
125. Slide Bar Left Upper Main - Sheet 1
126. Slide Bar Left Lower Main - Sheet 1
127. Slide Bar Overlay - Sheet 1
128. Slide Bar Overlay - Sheet 1
129. Slide Bar Overlay - Sheet 1
130. Slide Bar Overlay - Sheet 1
131. Slide Bar Overlay - Sheet 1
132. Slide Bar Overlay - Sheet 1
133. Slide Bar Right Upper Main - Sheet 1
134. Slide Bar Right Lower Main - Sheet 1
135. Slide Bar Overlay - Sheet 1
136. Slide Bar Overlay - Sheet 1
137. Slide Bar Overlay - Sheet 1
138. Slide Bar Overlay - Sheet 1
139. Slide Bar Overlay - Sheet 1
140. Slide Bar Overlay - Sheet 1
Bogie
141. Bogie Frame - Sheet 1
142. Bogie Side Overlay - Sheet 1
143. Bogie Side Overlay - Sheet 1
144. Bogie Equalising Bar - Sheet 1
145. Bogie Equalising Bar - Sheet 1
146. Bogie Equalising Bar - Sheet 1
147. Bogie Equalising Bar - Sheet 1
148. Bogie Stretcher
149. Spring Face Plate - Sheet 1
150. Spring Face Plate - Sheet 1
151. Spring Backing Plate - Sheet 1
152. Spring Backing Plate - Sheet 1
153. Spring Backing Plate - Sheet 1
154. Spring Backing Plate - Sheet 1
155. Spring Backing Plate - Sheet 1
156. Spring Backing Plate - Sheet 1
157. Bogie Pivot - Sheet 1
158. Bogie Pivot - Sheet 1
159. Bogie Pivot - Sheet 1
160. Bogie Pivot - Sheet 1
161. Bogie Pivot - Sheet 1
162. Bogie Pivot - Sheet 1
163. Bogie Pivot - Sheet 1
164. Bogie Pivot - Sheet 1
165. Hex Bolt Head - Sheet 1
166. Hex Bolt Head - Sheet 1
167. Bogie Spring Hanger - Sheet 1
168. Bogie Spring Hanger - Sheet 1
169. Bogie Spring Hanger - Sheet 1
170. Bogie Spring Hanger - Sheet 1
Cross Heads
171. Cross Head Rear - Sheet 2
172. Cross Head Rear - Sheet 2
173. Cross Head Overlay - Sheet 2
174. Cross Head Overlay - Sheet 2
175. Cross Head Inner Layers A - Sheet 2
176. Cross Head Inner Layers A - Sheet 2
177. Cross Head Inner Layers A - Sheet 2
178. Cross Head Inner Layers A - Sheet 2
179. Cross Head Inner Layers B - Sheet 2
180. Cross Head Inner Layers B - Sheet 2
181. Cross Head Inner Layers B - Sheet 2
182. Cross Head Inner Layers B - Sheet 2
183. Cross Head Top Overlay - Sheet 2
184. Cross Head Top Overlay - Sheet 2
Valve Gear
185. Valve Rod Left Outer - Sheet 2
186. Valve Rod Left Inner - Sheet 2
187. Valve Rod Right Outer - Sheet 2
188. Valve Rod Right Inner - Sheet 2
189. Outer Rod End Strip - Sheet 2
190. Outer Rod End Strip - Sheet 2
191. Outer Rod End Strip - Sheet 2
192. Outer Rod End Strip - Sheet 2
193. Outer Rod End Spacer - Sheet 2
194. Outer Rod End Spacer - Sheet 2
195. Inner Rod End Strip - Sheet 2
196. Inner Rod End Strip - Sheet 2
197. Inner Rod End Strip - Sheet 2
198. Inner Rod End Strip - Sheet 2
199. Inner Rod End Spacer - Sheet 2
200. Inner Rod End Spacer - Sheet 2
201. Eccentric - Sheet 2
202. Eccentric - Sheet 2
203. Eccentric - Sheet 2
204. Eccentric - Sheet 2
205. Eccentric Bracket - Sheet 2
206. Eccentric Bracket - Sheet 2
207. Eccentric Bracket - Sheet 2
208. Eccentric Bracket - Sheet 2
209. Eccentric Short Bracket - Sheet 2
210. Eccentric Short Bracket - Sheet 2
211. Eccentric Short Bracket - Sheet 2
212. Eccentric Short Bracket - Sheet 2
213. Lifting Arm - Sheet 2
214. Lifting Arm - Sheet 2
215. Lifting Arm - Sheet 2
216. Lifting Arm - Sheet 2
217. Rotation Arm - Sheet 2
218. Rotation Arm - Sheet 2
219. Rotation Arm - Sheet 2
220. Rotation Arm - Sheet 2
221. Rotation Arm End Spacer - Sheet 2
222. Rotation Arm End Spacer - Sheet 2
223. Rotation Arm End Spacer - Sheet 2
224. Rotation Arm End Spacer - Sheet 2
225. Balance Arm - Sheet 2
Page 10 GCR Class 8B
Page 10 GCR Class 8B
226. Valve Rod End - Sheet 2
227. Valve Rod End - Sheet 2
Spares
228. Alternative Cylinder Cover Left
229. Alternative Cylinder Cover Right
Templates
230. Eccentric Template - Sheet 2
231. P4 Width Template - Sheet 3
232. P4 Width Template - Sheet 3
233. EM Width Template - Sheet 3
234. Spare
235. Spare
8C Frames
236. Rear Frame Left - Sheet 2
237. Rear Frame Right - Sheet 2
238. Rear Wheel Spring Mount Locator - Sheet 2
239. Rear Wheel Spring Mount Locator - Sheet 2
NiSi Springs (optional)
240. Spring Layers - Sheet 3
241. Spring Layers - Sheet 3
242. Spring Layers - Sheet 3
243. Spring Layers - Sheet 3
244. Spring - Sheet 3
245. Spring - Sheet 3
246. Spring Support Back - Sheet 3
247. Spring Support Back - Sheet 3
248. Spring Support Back - Sheet 3
249. Spring Support Back - Sheet 3
250. Spring Support Back - Sheet 3
251. Spring Support Back - Sheet 3
252. Spring Front - Sheet 3
253. Spring Front - Sheet 3
Common Parts
1. Drwg. 201 Backhead (1 supplied)
2. Drwg. 203 Footplate Side Cover (2 supplied)
3. Drwg. 205 Oil Box Covers (6 supplied)
4. Drwg. 206 Sand Box Filler (2 supplied)
5. Drwg. 209 Centre Axle Spring (2 supplied)
6. Drwg. 211 Counter Weight (1 supplied)
7. Drwg. 212 Cylinder Front (2 supplied)
8. Drwg. 215 Eccentric Plate (4 supplied)
9. Drwg. 216 Rear Buffer (2 supplied)
10. Drwg. 218 Vacuum Cylinder (1 supplied)
11. Drwg. 219 Bogie Pivot (1 supplied)
12. Drwg. 225 Bogie Axle Box (4 supplied)
13. Drwg. 229 Whistle Markits M4WhistGW2
14. Drwg. 244 Vacuum Pipe Markits (1 supplied) &
Steam Heating Pipe Markits (1 supplied)
15. Drwg. 245 Handrail Knobs
16. Drwg. 246 Reverser
17. Drwg. 249 GCR 3’ 6” Axle Box (2 supplied) - cast
items
18. Drwg. 258 Smoke Box Door (1 supplied)
19. Drwg. 260 Martkits M4HRKWDs (12 Supplied)
20. Drwg. 261 MarkitsRAXFBsq601 axle boxes (4
supplied)
21. Drwg. 262 GC Smoke Box Handle Markits
M4SBDH4
Board 1
22. Brass Wire 0.3 mm Eileen’s BSW031A (25 cm x 2
supplied)
23. Brass Wire 0.45 mm Eileen’s BSW045A (25 cm x
4 supplied)
24. Brass Wire 0.7 mm Eileen’s BSW070A (25 cm x 1
supplied)
25. Nickel Silver Wire 1.6 mm Eileens NSW160A (25
cm supplied)
26. Spring Wire Ernie Ball Gauge 12 (25 cm supplied)
Board 2
27. Reversing Axle Tube 1/16” x1 /32” (1.6 mm x 0.8
mm) Eileen’s BRT0201G (5 cm supplied)
28. Reversing Axle Rod 1/32” (0.8 mm) Eileen’s
BSW080A (5 cm supplied)
29. Valve Rod Tube 3/32” x 1/16” (2.4 mm x 1.6 mm)
Eileen’s BRT0302G 300 mm (10 cm supplied)
30. Cab Roof Front & Rear Brace (‘L’) Eileen’s Brass L
Section 1/32" x 1/32" x 12" (KS A1) (15 cm
supplied)
31. Cab Roof Centre Brace (‘T’) Brass T Section 1/32"
x 1/32" x 12" (KS T1) (5 cm supplied)
32. Brass Round Tube 0.8 mm x 0.4 x 305 mm (MT2)
Eileen’s BRT0804D (smoke box hinges) (5 cm
supplied)
Sundries (Drwg. 266)
33. Dome Head Rivet 08MBV07B (2 supplied)
34. 10 BA Bolts (4 supplied)
35. 10 BA Nuts (4 supplied)
36. 14 BA Bolts (4 supplied)
37. Washout Plugs Eileens LF4WP01 (9 supplied)
Alternative 3D printed components if required
1. Drwg. 224 Spring Hanger Blocks (2 supplied) may be used as an alternative to the etch version
2. Drwg. 247 B1C4 Brakes (4 supplied) - may be
used as an alternative to the etch version or top
of the etch base for additional strength - allows
brakes to sit very close to wheels
3. Drwg. 249 GCR 3' 6" Axle Box (2 supplied) replaces casting if not available
4. Drwg. 257 C4 Rear Brakes (2 supplied) - may be
used as an alternative to the etch version or top
of the etch base for additional strength - allows
brakes to sit very close to wheels
Page 11 GCR Class 8B
Page 11 GCR Class 8B
Locomotive Body
0.012’ 0.3 mm Brass
Boiler
1. Boiler - Sheet 4
2. Boiler Front - Sheet 4
3. Boiler Rear - Sheet 4
4. Smoke Box Frame +EM - Sheet 6
5. Smoke Box +EM - Sheet 6
6. Smoke Box Wrapper - Sheet 5
7. Smoke Box Wrapper Riveted - Sheet 5
8. Smoke Box Step - Sheet 4
Footplate
9. Footplate Left +EM - Sheet 6
10. Footplate Right +EM - Sheet 6
11. Footplate Rear +EM - Sheet 6
12. Footplate Front - Sheet 6
13. Footplate Hinge - Sheet 6
14. Footplate Hinge - Sheet 6
15. Lamp Bracket Footplate - Sheet 6
16. Lamp Bracket Footplate - Sheet 6
17. Lamp Bracket Footplate - Sheet 6
18. Valence Left - Sheet 4
19. Valence Right - Sheet 4
20. Splasher Side Left Front - Sheet 4
21. Splasher Side Left Centre - Sheet 4
22. Splasher Side Right Front - Sheet 4
23. Splasher Side Right Centre - Sheet 4
24. Not Defined
25. Not Defined
26. Splasher Top Left Front +EM - Sheet 6
27. Splasher Top Left Centre +EM - Sheet 6
28. Splasher Top Right Front +EM - Sheet 6
29. Splasher Top Right Centre +EM - Sheet 6
30. Footplate Support Top+EM - Sheet 6
31. Footplate Support Top+EM - Sheet 6
32. Footplate Support Top+EM - Sheet 6
33. Footplate Support Top+EM - Sheet 6
34. Footplate Support Bracket+EM - Sheet 6
35. Footplate Support Bracket+EM - Sheet 6
36. Footplate Support Bracket+EM - Sheet 6
37. Footplate Support Bracket+EM - Sheet 6
38. Oil Filler Caps - Sheet 4
39. Oil Filler Caps - Sheet 4
40. Oil Filler Caps - Sheet 4
41. Oil Filler Caps - Sheet 4
42. Oil Filler Caps - Sheet 4
43. Oil Filler Caps - Sheet 4
Fire Box
44. Fire Box - Sheet 4
45. Fire Box Cab - Sheet 4
46. Inspection Cover - Sheet 5
47. Inspection Cover - Sheet 5
48. Inspection Cover - Sheet 5
49. Inspection Cover - Sheet 5
50. Inspection Cover - Sheet 5
51. Fire Box Brace - Sheet 5
52. Fire Box Brace - Sheet 5
53. Fire Box Brace - Sheet 5
54. Fire Box Brace - Sheet 5
Cab
55. Cab Side Left - Sheet 5
56. Spare
57. Cab Side Right - Sheet 5
58. Spare
59. Not Defined
60. Not Defined
61. Edging Left Strip - Sheet 5
62. Edging Right Strip - Sheet 5
63. Cab Front - Sheet 5
64. Cab Window Overlay - Sheet 5
65. Cab Window Overlay - Sheet 5
66. Cab Window Overlay - Sheet 5
67. Cab Window Overlay - Sheet 5
68. Roof - Sheet 5
69. Reversing Arm Cab End - Sheet 4
70. Reversing Arm Chassis End - Sheet 4
71. Reversing Arm Cab Arm - Sheet 4
72. Reversing Arm Actuator - Sheet 4
73. Reversing Arm Actuator - Sheet 4
74. Reversing Lever Front Actuator - Sheet 4
Cupboards
75. Cupboard Left - Sheet 5
76. Cupboard Right - Sheet 5
77. Door Hinge - Sheet 5
78. Door Hinge - Sheet 5
79. Door Hinge - Sheet 5
80. Door Hinge - Sheet 5
81. Footboard Left - Sheet 5
82. Footboard Right - Sheet 5
83. Shelf Left - Sheet 5
84. Shelf Right - Sheet 5
85. Cab Handle - Sheet 5
86. Cab Handle - Sheet 5
87. Cab Handle - Sheet 5
88. Cab Handle - Sheet 5
89. Cab Floor - Sheet 6
Steps
90. Centre Step Plate Left - Sheet 4
91. Centre Step Left Upper - Sheet 4
92. Centre Step Left Lower - Sheet 4
93. Centre Step Plate Right - Sheet 4
94. Centre Step Right Upper - Sheet 4
95. Centre Step Right Lower - Sheet 4
96. Rear Step Plate Left - Sheet 4
97. Rear Step Left Upper - Sheet 4
98. Rear Step Left Lower - Sheet 4
99. Rear Step Stabiliser - Sheet 4
100. Rear Step Plate Right - Sheet 4
101. Rear Step Right Upper - Sheet 4
102. Rear Step Right Lower - Sheet 4
103. Rear Step Stabiliser - Sheet 4
Cylinders
104. Cylinder Cover Left - Sheet 4
Page 12 GCR Class 8B
Page 12 GCR Class 8B
105. Cylinder Cover Right - Sheet 4
Springs
106. Axle Box Spring Mount - Sheet 4
107. Axle Box Spring Mount - Sheet 4
108. Axle Box Spring Mount - Sheet 4
109. Axle Box Spring Mount - Sheet 4
110. Rear Wheel Spring Mount - Sheet 5
111. Rear Wheel Spring Mount - Sheet 5
Wheels
112. Centre Wheel Weights - Sheet 5
113. Centre Wheel Weights - Sheet 5
114. Wheel Weights - Sheet 5
115. Wheel Weights - Sheet 5
116. Not Defined
117. Not Defined
Bits and Pieces
118. Lamp Bracket Top - Sheet 4
119. Smoke Box Handle - Sheet 4
120. Smoke Box Handle - Sheet 4
121. Regulator Lever - Sheet 4
122. Regulator Plate - Sheet 4
123. Regulator Plate - Sheet 4
124. Footplate Connection - Sheet 4
125. Smoke Box Door Hinge - Sheet 4
126. Cab Roof Blanking Plate - Sheet 5
127. Ramsbottom Actuators - Sheet 4
128. Ramsbottom Actuators - Sheet 4
129. Ramsbottom Side Cover - Sheet 5
130. Rear Wheel Spring Mount Locator - Sheet 5
131. Rear Wheel Spring Mount Locator - Sheet 5
Assembly Aids
132. Valence Spacing Aids +EM - Sheet 5
133. Valence Spacing Aids +EM - Sheet 5
134. Valence Spacing Aids +EM - Sheet 5
135. Valence Spacing Aids +EM - Sheet 5
136. Footplate Assembly Aid - Sheet 4
137. Cab Assembly Aid - Sheet 5
138. Cab Assembly Aid - Sheet 5
139. Fire Box Support Aid - Sheet 5
140. Fire Box Support Aid - Sheet 5
141. Belpaire Filing Aid - Sheet 5
GCR Class 8B
1. Drwg. 254 Dome Original (1 supplied)
2. Drwg. 251 Chimney Original (1 supplied)
3. Drwg. 239 Ramsbottom 4-column Safety Valve
4M778 Alan Gibson
LNER C4
4. Drwg. 252 Chimney Flowerpot (1 supplied) or
Drwg. 253 Chimney GCR Pseudo (1 supplied)
5. Drwg. 255 Dome Reduced (1 supplied)
6. Drwg. 228 Snifter (1 supplied)
7. Ross Pop Safety Valves Markits MASftyV7 £3.26
(2 supplied)
Additional Parts Required - not part of the kit
Wheels, motors and gears are a personal choice - these were
the ones used by the designer
1. Wheels Gibson G4880B 6’ 8” Dia. Alan Gibson
2. Crank Pins 4M42B Alan Gibson
3. Bogie Wheels G4842 3’ 6” Dia. Alan Gibson
4. Rear Wheel G4851 4’ 3”12 Spoke Alan Gibson
5. High Level Gear Box SlimLiner 40:1 2mm shaft
6. Mashima Motor 2mm shaft
7. Buffers AG 4M4901 £5.00 set of four or 4M4909
or Markits LNER Stepped
8. Markits Screw Couplings MCOUP/S
Recommended Tool
If 14 BA bolts are used to fix the cosmetic springs
CSTB141 Carbon Steel Taper Tap 14BA Eileen’s £14.40
If the eccentrics are fitted you will need a 16 BA tap
Carbon Steel Taper Tap 16BA CSTB161 £20.00
Page 13 GCR Class 8B
Page 13 GCR Class 8B
Main Frame Preparation
Note
You may wish to leave the main frames in the fret while
preparing them. I have found this a lot easier and only remove
the frames from the fret when I am ready to join the frames
together
Note
There seems to be a little photographic evidence that when first
built there were no visible, proud rivets on the frames under the
smoke box. Check photographs if this is of concern.
Before pushing out the rivets around the top of the frame under
the smoke box and those on the fire box sides you may wish to
test the pressure needed using the spare half etched holes which
are on Sheet 1.
Note that the frames on this locomotive have a distinct bend
inwards under the smoke box and this is modelled in P4 only.
Since the frames need to be closer together for EM gauge, they
must remain straight and therefore a short piece of 0.45 mm
wire should be soldered into the bend slot to strengthen the
frame at this point.
Note - small radius running
On the inside of the frames above the position of the bogie are
half etched lines. These indicate the cutting needed to allow the
bogie to move much more than would be prototype practice. If
your curves are less than 1200 mm radius then these must be cut
out. It is better to do this when the frames are assembled and
have some rigidity.
Push out the rivets under the smoke box, be careful with the top
row, they are close to the edge. Use the “Play Pen” area on Sheet
2 to practice.
Drill out the frame stiffener locating holes to 0.3 mm in Frame
Left (1) and Frame Right (2) - see picture right.
Measure the short handrail tails which will be used for the
springs (they will be about 0.7 mm diameter) and then drill out
the 6 spring mount positions shown (and marked as 0.65 mm in
the picture on the right) if you require active springing. Push the
handrails supplied into place on the inside of the frames, using a
length of 0.3 mm steel wire through the holes to align them and
solder them into place. Carefully file off the protruding tails on
the outside of the frames.
Drill out the holes for the cosmetic, removable springs, 6 each
side, which are located either side of the horn block spacing for
the front and rear axles only, to 0.80 mm to clear 16 BA c/s bolts
(not supplied) or 1.05 mm to clear 14 BA c/s bolts (supplied).
Carefully countersink the outer face very slightly for the fixing
bolts.
Drill out the brake shaft holes, 3 each side, to 0.7 mm - see
picture right.
Drill out the reversing arm holes to 0.8 mm - see picture right.
1. Frame Layout
9. Cab Base Support
Wheel Height Centres
Spring Mounts
Cosmetic Removable Springs
12,13,14,15. Rear Frame Spacer
16-18. Centre Frame Spacer
Reversing Arm
19-21. Valve Guide
Fire Box
Brake Shaft
Brake Shaft
Spring Mounts
38. Footplate Fixing Bracket
Cut Out Guides for
small radii running
0.33 mm
0.33 mm
0.33 mm
0.7 mm
0.5 mm
0.5 mm
0.5 mm
0.5 mm
0.7 mm
0.65 mm
0.65 mm
0.65 mm
0.65 mm
24,25. Buffer Supports
11. Smoke Box Base
48. Bogie Mount
26,27. Sand Boxes
0.65 mm
0.65 mm
Spring Mounts
10. Fire Box Base
0.8 mm
Rear Wheel Centre
Rear Wheel Brake Shaft
Rear Wheel Spring Mount
Locators (238,239)
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