Mount Washington Transit Tunnel

Mount Washington Transit Tunnel
North portal to the tunnel
Overview
Other name(s)Mount Washington Trolley Tunnel
Line
LocationPittsburgh, Pennsylvania, U.S.A.
StatusOperational
SystemPittsburgh Light Rail
StartStation Square
EndSouth Hills Junction
Operation
Work begunOctober 6, 1902
OpenedDecember 1, 1904
OperatorPittsburgh Regional Transit
Technical
Design engineerAmos D. Neeld
No. of tracks2
Track gauge5 ft 2+12 in (1,588 mm) Pennsylvania trolley gauge

The Mount Washington Transit Tunnel is a tunnel for buses and light rail trains under Mount Washington in Pittsburgh, Pennsylvania. The Mount Washington Transit Tunnel is a central component of the Pittsburgh public transit system operated by Pittsburgh Regional Transit, providing a direct connection between Downtown Pittsburgh and the South Hills suburbs. The tunnel was built for the trolley services of Pittsburgh Railways, the predecessor of the modern-day Pittsburgh Light Rail system, and has been used exclusively for public transit since its construction.

The tunnel, formerly known as the Mount Washington Trolley Tunnel, opened for trolleys in 1904, and was converted to a shared rail-bus tunnel in 1973. It is the only shared rail-bus tunnel in the United States since the 2019 conversion of the Downtown Seattle Transit Tunnel to rail only. The construction of the Mount Washington Transit Tunnel was instrumental in the development of the South Hills, as it shortened travel times significantly compared to its predecessors. Today, the tunnel still provides a significant time savings for transit services; the alternate surface route for light rail trains, the former Brown Line, adds over 8 minutes of travel time compared to the tunnel.[1]

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