The Budd Company’s brochure for the Rail Diesel Car(RDC). The RDC was a last gasp attempt to save little used branchline passenger traffic and provide service where a complete train was no longer required. The cars were also used by the B&M and New Haven heavily in Boston commuter service. The cars were amazingly durable and reliable, some running in constant service for over 40 years. Indeed, there are some still around.
The RDC was built in five different types. The RDC 1 was all coach. The RDC 2 was coach with a baggage express section. The RDC 3 was Railway Post Office, Baggage and coach. The RDC 4 was RPO and Express with no coach section. The RDC 9 was all coach with no cabs for use in the Boston commuter service by the B&M.
I found this brochure in among my old railroad magazines. I had forgotten I had it and wanted to share before it went into my files.
The Wiki:
https://en.wikipedia.org/wiki/Budd_Rail_Diesel_Car
Bonus:
Clear Iron, a film Budd had made about RDC’s
The Arts Mechanical 
Kind of surprised that railroads aren’t doing this again. Cheaper and easier than light rail.
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