Shawn Beckert says:

"I'm not even sure how far past the early 1950's this car was used on
American railroads."

I photographed one (SHPX 504) in Camden on August 9, 1969.

In addition to the brass model there was once a construction article in (I
believe) Model Railroader for building a model in brass, and long before that, I
bought for about a dollar, and assembled, a wooden kit for one.

John C. La Rue, Jr.
Bonita Springs, FL