Re: coupler distance over car end


vapeurchapelon
 

Hello Dennis,
 
wow! This is GREAT information which helps a lot! Many thanks!
One problem is that most brass cars don't have a coupler box already in place but just a cut-short at a non-defined place center sill instead, and several models obviously have the threads for the coupler box set at a wrong place...
 
Johannes
 
Gesendet: Dienstag, 03. März 2020 um 16:30 Uhr
Von: "Dennis Storzek" <destorzek@...>
An: main@RealSTMFC.groups.io
Betreff: Re: [RealSTMFC] coupler distance over car end
Johannes,

You first need to determine where the center sills actually end. In North American practice in our era, the sills were typically capped by a massive casting known as the 'striker casting', its purpose being to receive the blow from the 'striker horn' on the coupler when under heavy impact, to keep the draft gear from being damaged. Rule of thumb for freight cars built after the mid thirties is this is 5'-6" from the truck kingpin. Most drawings and equipment diagrams dimension the truck centers, and most also dimension the length over strikers. Tabular data normally includes length over strikers. Note that the striker is usually several inches out from the end sill, but this dimension varies.

The ARA/AAR Type D coupler, in use from just before WWI, and the Type E, still the current standard, are 12" from 'pulling face', the inside of the knuckle, to the back of the striker horn. Steam era draft gear typically had 3" of traven, putting the pulling face 15" from the striker casting. Earlier MCB approved coupler designs were smaller, typically 9.25" from pulling face to striker horn, so cars so equipped couple closer together.

Dennis Storzek

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