The Otisville Tunnel is the longest tunnel on New York's Metro-North commuter railroad, at 5,314 feet (1,620 m) in length. Although the track curves at the western opening, underground the tunnel is a straight line, allowing the observer to see all the way through.
It is currently owned by Metro-North, having been sold by the Norfolk Southern Railway in 2003.
The tunnel was built in 1908 by the Erie Railroad at the highest point of the Graham Line. The original Erie main line went over the hill and connected at both ends with the tunnel. Later the "over the hill" tracks were abandoned and all trains ran through the tunnel.
Metro-North took over passenger service in 1983.
- "Improvements on the Erie Railroad". Railway and Locomotive Engineering. 24 (8): 327. August 1911. Retrieved 2011-11-04.
- Historic American Engineering Record (HAER) No. NY-21, "Erie Railway, Otisville Tunnel"
- Pictures of the eastern portal and Otisville Station
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