The First Street Tunnel is a two-track, soft-earth tunnel built between 1904 and 1906 by the Washington Terminal Company to serve as the southern approach to Union Station in Washington, D.C. Currently owned by Amtrak, it connects to lower-level tracks and platforms at the station, passes under Capitol Hill and connects to the RF&P Subdivision (CSX Transportation) and Long Bridge, offering through railway service to Alexandria, Virginia, and points west and south.
Unlike the Northeast Corridor tracks north of Union Station, the tunnel tracks are not electrified, so southbound trains leaving Union Station must switch to diesel locomotives before entering the tunnel. Exiting Union Station, the tunnel runs due south under First Street NE and SE before curving to the southwest under a parking lot near the Capitol South Metro station. Its southern portal is just east of South Capitol Street at the intersection of D Street SE and New Jersey Avenue SE.
The tunnel's height is 17 feet (5.2 m).[1][2]
^"Tunnel under the Capitol" (PDF). The New York Times. September 10, 1903. Retrieved April 14, 2008.
^Strouse, W.F. (1911). "The Reconstruction of the Passenger Terminals at Washington, D.C." Transactions of the American Society of Civil Engineers. 71: 134–144. doi:10.1061/TACEAT.0002280. Paper No. 1180.
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