The Summit Tunnel in England is one of the oldest railway tunnels in the world: it was built between 1838 and 1841 by the Manchester and Leeds Railway beneath the Pennines. The tunnel is located between Littleborough and Walsden, Todmorden and created a vital gateway between Manchester and Leeds.
The tunnel is just over 1.6 miles (2.6 km) long and carries two standard-gauge tracks in a single tube, which is shaped like a horseshoe approximately 7.2 m wide and 6.6 m high.