Old hogger
I wouldn't worry too much about repainting the car PRR unless you really want a Pennsy box car. The X-43C isn't really so much a Pennsy design as it is a PRR designation for a specific batch of commercially built 40 foot box cars built to a very common post WW II design. As Ed has pointed out the Atlas model has improved dreadnought ends, a Stanray diagonal panel roof and riveted construction. Thousands and thousands of post WW II 40 foot box cars shared those features.
It is kind of odd how Atlas and MTH make 40' 1937 AAR box car models and Lionel MTH and Weaver make 40' PS-1 box car models but the Atlas Trainman 40' box car is the only plastic model available of one of the most common cars ever built.
