	The B&O had been using RDCs in local Baltimore–Washington, D.C., commuter service since 1950. Pleased with their reliability and lower operating costs compared to heavyweight passenger trains drawn by steam locomotives, the B&O decided in 1955 to replace its money-losing "Washingtonian" steam train with RDCs, ordering four RDC-1s with reclining coach seats and two RDC-2s with baggage compartments. The RDC-equipped "Daylight Speedliner" entered service on October 28, 1956, and reduced the railroad's operating expenses by almost half, compared to the "Washingtonian" train it replaced.