2005 Peirce Behrendt
Built by the Budd Company, this is also commonly referred to as a "Budd Car." It is self-powered by two 640 hp diesel engines, connected to the wheels with drive shafts in a manner similar to an automobile. RDC stands for Rail Diesel Car.
This unit is fully restored and used in the Danbury Railway Museum's railyard rides.
There are two engines, hydrolic drive with about 280hp each, for a total of 560hp. It is an rdc 1, which carries 90 people, with 2 operators. It has a cab unit at each end, so it doesn't need turning at the end of the line.
P.S. The engines are under the car, the hump on the roof is for air conditioning.
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I would have to check the specs, but I believe this would carry about 50 passengers.