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| Flat Rock Tunnel ： ウィキペディア英語版 |
Flat Rock Tunnel
The Flat Rock Tunnel is an active railroad tunnel located on Norfolk Southern's Harrisburg Line near Manayunk, Pennsylvania, USA. The tunnel was built by the Reading Railroad for its line along the Schuylkill River.
Construction of the tunnel started in 1836 and it opened in 1840. In 1858-9 the Flat Rock and Black Rock Tunnels were widened to accommodate the wider rolling stock from the Lebanon Valley Branch. The spacing between the tracks was increased from to . The widening of the tunnel was the first project to employ electric detonation of multiple explosive charges.
==See also==
* List of tunnels documented by the Historic American Engineering Record in Pennsylvania
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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