Re: Coupler/Bolster 'Standards'/RPs and the NMRA


Westerfield <westerfield@...>
 

Paul - The "NMRA coupler" was never adopted as a standard by the NMRA. Designed by Paul Mallery, it functioned well and was cheap to make at a time when there were real problems with interchange between manufacturers' kits. However, at just about the same time Kadee came out with their product which became the de facto standard - exept that it was costly and not sold to other manufacturers. The horn hook coupler was instrumental in bringing HO scale to the forefront of the hobby. - Al

----- Original Message -----
From: Paul
To: STMFC@...
Sent: Sunday, October 08, 2006 11:46 AM
Subject: RE: [STMFC] Coupler/Bolster 'Standards'/RPs and the NMRA


Jim:

You have to be careful of what you ask for. You are just liable to get the
"X2F" NMRA Coupler back.

Paul C. Koehler

_____

From: STMFC@... [mailto:STMFC@...] On Behalf Of Jim
Betz
Sent: Sunday, October 08, 2006 9:02 AM
To: STMFC@...
Subject: [STMFC] Coupler/Bolster 'Standards'/RPs and the NMRA

Guys,

There is one thing that we could do that would really help all of
us - both the MS and LS modelers amongst us.

If we would all lobby the NMRA to produce two new standards/recommended
practices we can make a lot of this stuff a lot easier.

Specifically, if the NMRA would specify a size and placement for the
bolster and mounting -pad- for the truck mounts and coupler mounts that is
relative to the top of the track and nothing else. Then any manufacturer's
truck or coupler box would be a drop in replacement for any other
manufacturer's.
I will not address other scales, but in HO scale it would be easy to
specify that the trucks and coupler boxes will be mounted with a single
2-56 screw thru a flat level place that is a specific distance from the
top of the track. I am also certain that the same thing can be done
in other scales ... I just don't know what size screw to recommend.
I'm not focused on the specific size of the screw - I just picked 2-56
because it works for HO from my perspective.
Please note that I am specifically not recommending that the NMRA
specify stuff like the size and shape of the coupler box itself - only
the size and shape of the place on the car that it mounts to and the
size screw that will go thru it.

If all cars were built to this spec/RP then changing out any brand
coupler or truck with any other would be a snap - and the NMRA would
also get itself out of the way of the manufacturers in terms of saying
any thing about the shape and design of the couplers and trucks.
Yes, this would mean that the bolsters of some trucks might not
be 100% prototypical in terms of size and shape - but all of that
would be way up underneath the car where it doesn't matter and the
stuff that you can see when the car is finished and on the track
would be able to be as prototypically correct as the maker of the
truck or coupler wants to make them.

I call this "The level playing field RPs". *G* - Jim in San Jose

P.S. Yes, I've sent this in to the NMRA. No, I didn't ever receive
anything other than an acknowledgement of the receipt of the
email.

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