Bolsover Tunnel
Bolsover Tunnel is a disused and infilled twin-track railway tunnel between Carr Vale and Scarcliffe in Derbyshire, England. At 2,624 yards (1+1⁄2 mi, 2.4 km) it was the 18th longest railway tunnel in Britain prior to its closure in 1951.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).