Here's another.
Budd built two of these baggage/coach/dinettes for the B&O in 1956. Named "Speed Liners" they were used in DC - Pittsburgh service. For a while, RDC number 1961 held down a weekend run from B&O's junction with the NY Central into Detroit on weekends, to preserve B&O's rights over the NYC line until it ended Detroit service in the late 1960's. Other than a few rail fans who knew about that run, there were hardly any passengers.
S. Islander