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Mount Washington Transit Tunnel
Mount Washington Transit Tunnel is an important public transportation link in Pittsburgh, Pennsylvania, United States. The approximately 〔Middleton, William D. (1967). ''The Time of the Trolley'', p. 195. Milwaukee, WI (US): Kalmbach Publishing Co. LCCN 67-20155.〕 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.
==History==
The tunnel was built by Booth and Flinn, as a replacement for the Pittsburgh and Castle Shannon Tunnel, but at a lower elevation. Excavation was started October 6, 1902, and the tunnel was officially opened December 1, 1904, for use by trolleys/streetcars only. Originally, steam powered trains ran through the tunnel, to be replaced by the first electric cars in 1909. It took over the transportation functions of the Castle Shannon Railway tunnel, which was originally a coal mine, but later used as a tunnel to transport coal, and later passengers, under Mt. Washington. Although this tunnel was closed to passengers in 1880, the urban legend persists that the Mt. Washington Transit Tunnel was originally a coal mine.
The tunnel was upgraded to allow for joint use by bus and trolley traffic in 1973, with several changes since.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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