Age and mechanical problems led the cars conversion to locomotive-hauled coaches beginning in 1982; the last self-propelled run occurred in 1986. In the late 1970s Budd sought to replace the aging RDCs with a new design, the SPV-2000. The body shell was based on an Amfleet coach, not the RDC. Like the RDC it was long, stainless steel, and powered by twin diesel engines. The design was beset with mechanical problems, and Budd sold only 30 cars. In 1966, Tokyu Car built 31 DR2700 series cars for the Taiwan Railway Administration. Tokyu got a licence from the Budd Company and the bodywork of the DR2700 series was based on the RDC. There were 25 powered driving cars (each with a Cummins diesel engine producing ) and 6 trailers. The DR2700 series was the fastest train in the following decade with a top speed of . They were withdrawn from regular service in 2014 while several powered driving cars were still active for special trains. From 1982 to 1984 Tokyo Car built 45 of a heavily specialized, meter-gauge RDC design for the Taiwan Railway Administration under license from Budd. Designated the DR2800 series, the units are organized into 15 permanently-coupled three-car sets (30 powered driving cars and 15 trailers). Like other RDC trainsets before them, each cab unit only has a cab at one end and two cab units bracket a trailer in a standard set. Unlike other RDC sets, however, the trailer's diesel engine is used exclusively to provide head-end power for the entire three-car set, while the engines in the driver cars are used for propulsion. To prevent dependency on the trailer's engine for cooling, the cooling fans of the driver cars are driven hydraulically instead of electrically. This configuration results in each set producing for a top speed of . All 15 sets are still in service. The vast majority of RDCs were owned and operated by railroads in the United States. They could be found on branch lines, short-haul intercity routes, commuter routes, and even long-distance trains. The Western Pacific Railroad used a pair of RDC-2s to operate the "Zephyrette", a supplement to the "California Zephyr". The two cars ran between Oakland, California and Salt Lake City, Utah, , three days a week. Examples of shorter intercity services were the Chicago, Rock Island and Pacific Railroad's Memphis, Tennessee–Amarillo, Texas "Choctaw Rocket" and the Baltimore and Ohio Railroad's "Daylight Speedliner".