EOC 10

Trains Magazine General Discussion
1

I watched a train with several TBOX boxcars slowly go by me yesterday (technically) and notice some interesting lettering on the ends at the bottom.

Gunderson and NSC built cars:
EOC 10
AAR M-921B
43" CPLR.

Trinity built cars:
EOC 10B
AAR M-921B
43" COUPLER

Presumably this has to do with end of car cushioning. When I did a search, I found an AAR Standards manual. It references Standard S-179, Section III: Yoke, Type F, Cushioning, for Pocket EOC-10 and EOC-26. Presumably the EOCs are types of cushioning. Does anyone know? It also references Standard M-921B, Section B Cushioning Devices, End of Car. There are some interesting looking standards in that list.

What does the 43" reference? One thought I had is that it is the travel for the EOC. However, that seems too long. There did not appear to be anywhere near that difference between cars from when the train was in tension to when it was in compression.

If I may go on a tangent, I noticed that some of the Gunderson cars’ class had been changed from XGH60 to XGH61.

2

Might have to do with the length of the drawbar. A car-knocker should be able to tell us the significance of this.

3

I found this end of car cushioning manual from ASF-Keystone. The travel is 15 inches and can be changed to 10 inches.

http://www.asfglobal.com/files/docs/Cushioning%20Manual.pdf

4

The 43" is the length of the coupler/drawbar. The coupler moves in and out of the cushioning unit. It is also long to allow for getting around tight turns, swivels farther.

5

Thanks

6

EOC (End of Car) Cushioning, 10 = AAR EOC Pocket 10 this is a standard pocket design. One of many differant arrangements. This unit is a 15" travel unit.

AAR M-921B, This is the AAR specification that the cushioning unit is designed too.

M-921B, spec is a cushioning unit with a designed preload of 100,000 lbs. of force required to move or compress the unit.

43" CPLR, 43" coupler, or E^* coupler the lenght from c/l of pin hole to pull face of coupler knuckle.