Last updated: 5 October 2009
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The 7mm instructions are included with the 3mm kit. This kit is very similar to the U and the supplementary etch and castings for the U are also appropriate to this kit. Therefore we have not assembled the test etch but we have checked the parts against the U. The construction of the N in 3mm scale is very similar to the U as described in:
Building the SR/BR U Class 0-6-0 in 3mm Scale
We would welcome constructive suggestions for improvements to this kit both with respect to its accuracy and ease of assembly, preferably by emailing john@jswalker.demon.co.uk.
We would like to thank David Andrews for providing us with the opportunity to use his 7mm kit as the basis for this development.
John Bateman and John Walker
15 October 2008
Go back to Building the SR/BR N Class 0-6-0 in 3mm Scale
The David Andrews etched parts are described in his instructions.
David has modified his etches for the 3500 gallon tender since the 7mm instructions were written. Parts A and B have been improved so that parts 60 and 61 are not required. Also the brake hangers and rods have been included on the thicker etch so that parts 62 and the laminations for parts 65 and 66 are not required. Note that parts J, K and L are not used.
The 3mm N kit includes parts R and S for the 4000 gallon tender. These parts are not required for the 3500 gallon tender.
Additional versions of the following parts are included for 12mm gauge:
Locomotive
Parts C and D are wider than the other 12mm spacers. They need to be filed back to suit.
The cylinder frame (77) for 12mm gauge is too wide at the top. It needs to be filed back so that it will fit down between the frames on top of spacer C.
Tender
In my notes I have appended an S to the part numbers on the Supplementary Etch. Parts referenced in parentheses are not numbered on the etch. I hope you can spot them!
| 7mm equivalent | |
| Smokebox door | 103 |
| Dome | 104 |
| Chimney, early (Derby) | 105 |
| Chimney (late) | 106 |
| Safety valves | 107 and 108 Safety valves and base |
| Whistle and steam fountain | 109 and 111 |
| Cover(firebox lhs) | 113 |
| Snifting valve (2) | 116 |
| Backhead | 117, 121 ,122 ,123, 125, 126 Backplate, regulator gland, tray, gauge glasses, oil boxes, valves |
| Reverser | 118 |
| Brake | 120 Brake and handle |
| Clack valve (2) | 130 Clack valve/piping |
| 7mm equivalent | |
| Front cylinder cover (2) | 135 |
| Alternative front cylinder cover (2) | |
| Rear cylinder cover (2) | 136 |
| Valve rear cover (2) | 141, 142 Valve rear cover and valve guide side |
| Valve front cover (2) | 144 |
| Valve end (4) | 145 |
| Drain cocks (4) | 147 Drain cocks (2) |
| 7mm equivalent | |
| Buffers (2) | 101 and 102 Buffer housing and head |
| Sandbox (2) | 112 |
| Sandbox filler pipe (2) | 114 |
| Sandbox filler lid (2) | 115 |
| Injector (original) | 131 Injector (2) original |
| Alternative injector | |
| Brake cylinder (2) | 133 |
| Battery box | 148 |
| Reservoir | 149 |
| 7mm equivalent | |
| Buffers (2) | 201, 202 Buffer housing and head |
| Axleboxes (6) | 213, 214 Axlebox and spring |
| Brake standard | 205 |
| Water treatment filler | 207 |
| Sandbox filler (2) | 208 |
| Water filler | 209 |
| Alternative tapered sandbox (2) |
Note that for the N, David Andrews has opened up the holes and half etch recesses to accommodate 12BA nuts and bolts.
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