The Budd RDC, short for Rail Diesel Car, was a complete passenger train in a single car. Each car was the same length as a full-sized passenger car (except for the rare RDC-4) and featured Budd's typical corrugated stainless steel exterior. Two 275-horsepower diesel engines mounted under the floor powered a mechanical transmission. Cooling radiators and exhaust stacks were mounted on the roof, making the car resemble a dome car. The RDC-1 is a 90-seat coach that was originally produced for commuter runs and short intercity runs. The RDC-2 and RDC-3 were ideal for passenger runs that handled mail and express; the RDC-2 seats 71 and has a 17' baggage compartment and the RDC-3 seats 49 and has a 17' baggage compartment and a 15' RPO compartment. Two more variations were also available, but were rare; the RDC-9 was a 94-seat trailer coach with no operator's cabs that had to be run with another RDC, and the RDC-4 was a 73' baggage-RPO only and carried no passengers.
 
In service, the cars were cheaper to operate than a conventional diesel-hauled train. Much like the gas-electric cars of the early 1900s, they replaced trains on lightly used branches, but a few roads used them to cover secondary long-distance runs of almost 1,000 miles. Because they had an operator's cab at both ends, they didn't require turning. RDCs helped many railroads cut operating losses on lightly patronized runs. The cars were successful and a few still operate on low-density intercity runs in Canada.
 
* 3 Popular Body Styles
* Magnetic Knuckle Couplers
* 4-Wheel Drive & 8-Wheel Electrical Pick-Up
* 5-Pole Skew-Wound Motor
* Flywheel Equipped
* Authentically Contoured Radiator with Realistic Fan
* Cab Ends Feature Windshield Wiper Details & Single-Chime Airhorns
* Realistic Trap Door & Step Details & Authentic Baggage Doors on RDC-2 & RDC-3 models.