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Rail Diesel Car

Rail Diesel Car (RDC)
Budd RDC-2 B&O 2.jpg
Budd RDC-1 interior 1949.JPG
Interior of the RDC-1 demonstrator in 1949
In service 1949–present
Manufacturer Budd Company
Constructed 1949–1962
Number built 398
Capacity
  • RDC-1: 90 passengers
  • RDC-2: 70 passengers, baggage section
  • RDC-3: 48 passengers, RPO, baggage section
  • RDC-4: RPO, baggage section
  • RDC-9: 94 passengers
Specifications
Car body construction Stainless Steel
Car length
  • RDC-1/2/3/9: 85 ft (25.91 m)
  • RDC-4: 73 ft 10 in (22.50 m)
Width 10 ft 0 38 in (3.06 m)
Height 14 ft 7 in (4.45 m)
Wheel diameter 33 in (838 mm)
Wheelbase
  • RDC-1/2/3/9: 68 ft (20.73 m)
  • RDC-4: 56 ft 10 in (17.32 m)
Maximum speed 85 mph (137 km/h)
Weight 113,120 lb (51,310 kg)
Prime mover(s)
Power output
  • RDC-1/2/3/4: 550 hp (410 kW)
  • RDC-9: 300 hp (220 kW)
Transmission Hydraulic torque converter
UIC classification
  • RDC-1/2/3/4: (1A)(A1)
  • RDC-9: (1A)2′
AAR wheel arrangement
  • RDC-1/2/3/4: 1A-A1
  • RDC-9: 1A-2
Braking system(s) Air
Track gauge 4 ft 8 12 in (1,435 mm)

The Budd Rail Diesel Car, RDC or Buddliner is a self-propelled diesel multiple unit (DMU) railcar. Between 1949 and 1962, 398 RDCs were built by the Budd Company of Philadelphia, Pennsylvania, United States. The cars were primarily adopted for passenger service in rural areas with low traffic density or in short-haul commuter service, and were less expensive to operate in this context than a traditional diesel locomotive-drawn train with coaches. The cars could be used singly or several could be coupled together in train sets and controlled from the cab of the front unit. The RDC was one of the few DMU trains to achieve commercial success in North America. RDC trains were an early example of self-contained diesel multiple unit trains, an arrangement now in common use by railways all over the world.

The self-propelled railcar was not a new concept in North American railroading. Beginning in the 1880s railroads experimented with steam-powered railcars on branch lines, where the costs of operating a conventional steam locomotive-hauled set of cars was prohibitive. These cars failed for several reasons: the boiler and engine were too heavy, water and fuel took up too much space, and high maintenance costs eliminated whatever advantage was gained from reducing labor costs. In the 1900s steam railcars gave way to gasoline, led by the McKeen Motor Car Company, which produced 152 between 1905–1917.J. G. Brill sold over 300 "railbuses" in the 1920s. Newcomer Electro-Motive Corporation, working with the Winton Motor Carriage Company, dominated the market at the end of the 1920s but had exited it completely by 1932 as the Great Depression gutted rail traffic.

The Budd Company entered the market in 1932, just as EMC exited. Heretofore Budd was primarily an automotive parts subcontractor but had pioneered working with stainless steel, including the technique of shot welding to join pieces of stainless steel. This permitted the construction of cars which were both lighter and stronger. Budd partnered with Michelin to construct several rubber-tyred stainless steel rail cars powered by gasoline and Diesel engines. These saw service with the Reading Company, Pennsylvania Railroad, and Texas and Pacific Railway. The cars were underpowered, the tires proved prone to blowouts and derailments, and the cars were unsuccessful.


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