Originally Posted by bob2:
A Budd car, for 3-rail, is an RDC for 2-railers. For 2- rail, a Budd car is a passenger car with distinctive stainless steel corrugations, usually distinguished from Pullmans by the continuation of corrugations across the roof. Most famous "Budd Cars" are the California Zephyr" cars, again released by Atlas.
I've always made the distinction between a Budd car and an RDC (and the distinction between an RDC 1, 2, 3, and 4). This is yet another little factoid that implies I've been a "closeted 2-railer" for more than two decades. You're scaring me, Bob 
