Promotional documentary released in 1952 by Marathon Newsreel Production in association with the Budd company. Shows the railcars being manufactured and in operation. Also features many steam and diesel trains from the early 1950’s. From en.wikipedia.org The Budd Rail Diesel Car or RDC is a self-propelled diesel-hydraulic multiple unit railcar. In the period 1949–62, 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 locomotive-drawn train. The cars could be used singly or several coupled together in train sets and controlled from the cab of the front unit. The RDC was one of the few versions of the DMU-type train diesel multiple unit to achieve commercial success in North America. The basic car was adapted from a standard 85 ft (25.91 m) coach. They were powered by two Detroit Diesel (then a division of General Motors) Series 110 diesel engines, each of which drives an axle through a hydraulic torque converter, a technology adapted from military tanks of World War II. RDC trains were an early example of self-contained diesel multiple units, an arrangement now in common use by railways all over the world.