Standedge Tunnels
Tunnels between Marsden and Diggle in northern England
Standedge Tunnels
The Standedge Tunnels () are four parallel tunnels through the Pennine hills at the Standedge crossing between Marsden in Kirklees, West Yorkshire and Diggle in Oldham, Greater Manchester in northern England. Three are railway tunnels (containing the Huddersfield line) and the other is a canal tunnel. Before local government boundary changes in 1974, both ends of the tunnels were in the West Riding of Yorkshire. The canal tunnel on the Huddersfield Narrow Canal was authorised by the Huddersfield to Ashton-under-Lyne Canal Act 1794 (34 Geo. 3. c. 53) on 4 April 1794. Construction of a 5,451-yard (4,984 m) tunnel began months later. Within two years, cost-saving measures pushed back its completion date and progress was slowed by water levels much greater than had been expected. In 1807, Thomas Telford drew up a new plan for its completion. In 1811, the tunnel opened. It is the longest and oldest of the four Standedge tunnels and is the longest, highest, and deepest canal tunnel in the United...
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