	The Daylight Speedliner was an American named passenger train of the Baltimore and Ohio Railroad (B&O) in the 1950s and early 1960s. Equipped with three or four streamlined, self-propelled Budd Rail Diesel Cars (RDCs) coupled together, it initially operated between Philadelphia, Pennsylvania and Pittsburgh, Pennsylvania, via Baltimore, Maryland, and Washington, D. C., as Trains #21–22.