5 ft 2+1⁄2 in (1,588 mm) Pennsylvania trolley gauge
Electrified
1909
Grade
5.86%
Mount Washington Transit Tunnel is an important public transportation link in Pittsburgh, Pennsylvania, United States. The 3,492-foot (1,064 m)[1][2] tunnel connects Station Square to South Hills Junction, and is used only by Pittsburgh Light Rail cars and buses of the Port Authority of Allegheny County. The tunnel changes 204.54 feet in elevation from its north portal at 750.36 feet above sea level to its south portal at 954.90 feet above sea level, resulting in a grade of 5.86%.[2] With the elimination of bus service in the Downtown Seattle Transit Tunnel in 2019, the Mount Washington Transit Tunnel is the only tunnel in the United States shared by bus and rail services.
^ abMiddleton, William D. (1967). The Time of the Trolley, p. 195. Milwaukee, WI (US): Kalmbach Publishing Co. LCCN 67-20155.
^ abHirt, Mary Jane Kuffner (2021). The Mount Washington Transit Tunnel Disaster. Charleston, SC: The History Press. pp. 79–80. ISBN 9781439672655.
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