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Modules built prior to the acceptance of these Standards will be exempt from these Standards. However, if non-conforming modules are to interface with conforming modules, a Transition module will be required to accommodate any difference in trackage, electrical, etc.
(*) denotes change from previous issue.
| Scale | Height From Floor To Top of Rail | Hand Laid or Commercial Rail Code | Track Clearances Per Standard S-6* | Interface Track Center Lines from Front of Module | Track Centers Parallel Tracks | Track Setback From End of Module | Center Lines on Curve |
|---|---|---|---|---|---|---|---|
| N | 40" (1016mm) |
(*)80** (20.6mm) O=21/32" (16.7mm) |
I=13/16" (101.6) 139.7 (177.8mm) |
4"-5 1/2"-7" (35.7mm) |
1-13/32" (35.7mm) |
2-1/2" (63.5mm) |
1-13/32" (35.7mm) |
| HO | 40" (1016mm) |
83 | I=1-1/2" (38.1mm) O=1-1/4" (31.8mm) |
5"-7" (127,177.8mm) |
2-1/16" (50.9mm) |
4-1/2" (114.3mm) |
2-9/16" (65mm) |
| S | 42" (1067mm) |
100 | I=2-1/32" (51.6mm) O=1-11/16" (42.9mm) |
6"-9" (152.4) (228.6mm) |
(*)2-3/4" (69.8mm) |
2"(*) (50.8mm) |
3-1/2" (88.9mm) |
| O | 42" (1067mm) |
125 | I=2-23/32" (69.1mm) O=2-9/32" (57.9mm) |
6"-10" (152.4mm) (254mm) |
3-3/4" (95.2mm) |
2"(50.8mm) | 4-21/32" (118.3mm) on min rad of 11-1/4" per Std S-6 |
| * I=Inside O=Outside |
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Length of modules for all scales/gauges will be 4', 6', and 8' with 2' minimum as a spacer or Transition module.***
Electrical Standard for Traction see NMRA Standard S-5, RP-12 and module electrical Standards.
Track Standards shall be prescribed by NMRA Standard S-5. Use of Standard S-6 track centers for curved track should be used ONLY where heavy multiple unit cars and electric locomotives will NOT be permitted to operate. Clearance requirements of S-7 and S-8 shall be utilized where standard railroad operating conditions exist.
Overhead structure Standards shall be prescribed by S-5. Overhead support at module interface shall be provided at no more than 1/2 normal pole spacing from interface, but in no case more than 50 scale feet. Overhead structure at interface shall provide for removable overhead section.
** NTRAK and N-CAT are using Atlas & Peco code 80 rail. Code 70 is allowed within the module but must be brought back to code 80 at interface.
*** See note (4), MS-1