Pacific Car and Foundry 50ft 70-Ton boxcars with 6'+8' Youngstown plug doors. These cars were primarily built for the Southern Pacific and Cotton Belt, which most would then go to the Golden West Service as a marketing effort, and then after that they went back to SP and various other companies. I'm not too sure about the WC cars since I could only find one picture of the cars in real life, but they definitely had them.