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Introduction
Currently, Sn2 is in it infancy. A few modelers have made models, and
published articles, but up until now there has not been a call for standards.
However, to ensure compatibility between models it is good to develop standards.
Manufacturers will also benefit from standards because their models will be compatible
with other Sn2 models. I am not suggesting that this page actually be standards,
but guidelines. The concepts presented here are the result of discussions on Sn2_Trains
yahoogroups list.
Sn2 Gauge is modeled using HOn3 (10.5mm):
- 24" in S scale is 3/8". However, most modelers do not choose
3/8" as the track gauge.
- HOn3 gauge, 10.5mm, is the gauge adopted by most modelers. It works out to
be 26.5" in S scale. At roughly 10% too large, it is a compromise.
- N gauge, 9mm, is roughly 23" gauge and closer to 24" than HOn3.
However, most Sn2 modelers prefer HOn3 gauge, because the components
(trucks, wheels, couplers, locos, ....) are closer to the size of S narrow
gauge than N scale components.
Maine 2-foot couplers and height:
The following standard only applies to Maine 2-foot prototypes. The Maine
railroads all used the same size coupler and had a common coupler height of
16" rail head to center and car underbody heights of 18" above the
rail.
Based on the size of the HOn3 coupler, which is about the same size as true
Sn2 couplers, the height of the car underbody, and the height of the coupler, we
had to make a choice. Not all three dimensions could be accomplished. The member
of the Sn2 e-mail list choose to compromise coupler height, and maintain body
height. We felt that body height defines the look of Maine 2-foot cars more so
than the coupler height.
Maine Sn2 Coupler Standard:
| Coupler Style: |
HOn3 (714) Kadee or HO Old Time (711)
coupler. The trip pins are snipped off. |
| Car Body Height: |
18" in S scale = 9/32" actual. For
cars, this is the distance from the rails to the underbody sills. |
| Coupler Height: |
14.5" in S scale = .226" actual |
This coupler centerline height is derived from mounting the 714 couplers at
the required body height. So, if one makes the body 18" (9/32"), then
the coupler height is automatically set.
This standard should hold for Passenger cars and Engines too.
The Sn2 Coupler FAQ provides inquiring
minds the details behind the Sn2 coupler standard.
Modules Specs:
Sn2 seems to be adopting a version of Free-Mo for Sn2. See the Sn2
Free-Mo Standards and Guidelines to learn more.
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