First Street Tunnel (Washington, DC)

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The First Street Tunnel is a two-track, soft-earth tunnel constructed between 1904 and 1906 by the Washington Terminal Company to serve as the southern approach to Union Station (Washington).

It connected lower-level tracks and platforms at the station, passes under Capitol Hill, Washington, D.C., and connects to Long Bridge offering through railway service to Alexandria, Virginia and points west and south.

Exiting Union Station southbound, the tunnel passes due south under First Street NE and SE before curving to the southwest. Its southern portal is just east of South Capitol Street at the intersection of D Street SE and New Jersey Avenue SE.