Chris thats pretty cool. I thought 346 was the only class 70/c-19 that had four flanged drivers.
Crackerjack Chris is right all the cab were built the same but some got a steel sheet applied on the out side. I own the firemans side of RGS 41 steel sheet.Got to find my pictures of it.
The extension on the box head lights I believe was a conversion for a different glass. Like square to round cut glass or maybe the other way around. Please someone correct me If I'm wrong.
Also 278 had at the time of the 401 photo you posted her Baldwin smoke box front. In fact it still has it today.