The other line was the highly ambitious west-east running Lancashire, Derbyshire and East Coast Railway, later part of the Great Central Railway and subsequently the London & North Eastern Railway. Only the middle section from Chesterfield to Lincoln was ever built, opening in March 1897 (the Bolsover station was Bolsover South), but the section between Chesterfield and Shirebrook was brought to a premature demise in December 1951 by the deteriorating state of its biggest engineering feature, the 2,624-yard (2,399-metre) Bolsover Tunnel which ran beneath the limestone ridge on which stands the castle. The tunnel was mostly filled in with colliery waste in 1966-67, and both ends sealed off. Today both portals are visible, the eastern portal at the end of an unusually deep sheer-sided cutting in the village of Scarcliffe and the western portal just to the south east side of Bolsover.