Yes it is specifically modeled on the PRR designed X43c, but it may be a suitable stand in for other roads' with a 40' long 8' door box car built in the post war era. If you are looking for a similar prototype to letter it for I recommend using the 10' 4" IH specification as a data filter. As for spotting features look for cars with a riveted body, improved dreadnought ends and diagonal panel roof. With relative ease you should be able to replace the style of doors, side sill tabs, and tack boards if need be
Ed Rappe
PS. The Chineese made AtlasO Trainman 40' steel box car is a close derivative of the 1970's Austrian built Atlas-Roco box car. Perhaps someone may be able to comment on the differences.