 A third system, the Washington and Old Dominion Railway (W&OD), began in the 1850s as the Alexandria, Loudoun and Hampshire Railroad, a steam railroad.It was leased by the newly formed W&OD, which in 1912 connected the line to the electrified Great Falls and Old Dominion Railroad.Electric trolleys last ran in 1941, but the company continued to operate freight trains (and passenger trains until 1951) until 1968.