Aircraft Parts Manufacturer and "SkyBox" freight cars.

[jwb]

Thanks, that's very interesting -- most of these cars have the simple 3-piece roof, as opposed to the 5-piece gambrel roof on the later SP and BN cars. The Santa Fe cars show photos of the shorter cars I listed in the Santa Fe ORER entry above -- they carry breaker bars (or whatever you call them) for the 737 fuselages.