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". The latter ran between Pittsburgh and Philadelphia and included full dining service. A notable example of the RDC's flexibility occurred on the Pennsylvania-Reading Seashore Lines, where a single train would depart Camden, New Jersey and split into multiple trains to serve different destinations on the Atlantic coast.