I see this was an old “post” that was put up again for discussion.
Back in the late '70’s -maybe early '80, Amtrak sent a few “Obs” east to Albany to fill out consists due to increasing ridership between Albany and New York. One had a diaphram (hope I spelled that right!) and the other a “straight” (that is, rounded end on rear) “Obs”.
If I remember correctly (I worked trains with these cars in the consist as Conductor), the one with the “diaphram” had the car in the front of the consist with observation end next to the engine. The one with the regular end, was placed on the end of the consist “properly pointed” (in railroad parlance!).
These cars stayed mostly in ALB-NYG-ALB service, but they did “stray”, once or twice to Montreal and a few times to Detroit(!) and Buffalo.
I remember one instance (with the “properly pointed” obs), I was the “Helper Conductor” (Amtrak changed it to “Assistant Conductor” when they assumed T & E in the '80’s) on #63 NYG-ALB (it was still running all the way to Detroit then), with a good friend “P.J.” as the Cdr on 12/22/78. It was a few days into the “Christmas Rush”, we had 14(!!!) cars, well over 600 passengers, and just P.J. and I working the train to ALB! We gave up trying to pick up “transportation(tickets)” and concentrated on getting people off/on at thier stations up the line…this was in days before radios, all signalling was done “hand” and signal cord to the engineer upfront…P.J. and I never saw each other after Croton (eng change from electric to diesel) until Albany! Over the years P.J. always had as good laugh about this and the old observation car on the rear!
The obs were sent west to Chicago a few monts later and I think that was the end of them…but can you imagine…a 14 car passenger train with a “properly pointed” observation car