Hoosac Tunnel
The first major rock tunnel built in the United States. The tunnel runs through Hoosac Mountain of the Berkshire Hills, east of North Adams, Mass., and was built to provide a rail connection between Boston and upper New York state. Though only 4.75 miles (7.6 km) long, the tunnel took 24 years (1851–75) to complete, partly because of slow and laborious rock-tunneling techniques in use when construction
posted by SuddenCat @ 1:38 PM
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