Cowburn Tunnel

The Midland Railway awarded the contract to J.P. Edwards of Nottingham.[1] Construction work started in October 1888 when a ventilation shaft was sunk in Cartledge Meadow near Edale.[2] The tunnel was engineered by the Midland Railway, under Colborne, part of a 1,700-foot (518 m) moorland between Kinder Scout and Rushup Edge. Tunneling also started at the other end near Chapel-en-le-Frith and the breakthrough between the two sections was made on 18 July 1891.[3] The lining out of the tunnel and laying of the rails was completed by March 1893, when the workmen were dispersed.[4]

It takes the Hope Valley Line west out of Edale valley, to emerge near Chapel Milton, 2.5 miles (4 km) east of Chinley railway station.[5]

Unusually, the tunnel is not built at a constant gradient: in fact, the summit of the line between Dore and Chinley lies within the tunnel, about a quarter of the way from the eastern end. From the summit, the tunnel falls at 1 in 100 (1%) eastwards and 1 in 150 (0.67%) westwards. Nevertheless, when the headings met, they were no more than 1 inch (25.4 mm) out of line in the vertical direction, and met exactly in the horizontal direction. Only one vertical shaft was used. Although the workings were much drier than they had been for Totley Tunnel, on one occasion the headings filled with water to a depth of 90 ft (27.4 m) and work was carried on in a diving bell.

• 
  The eastern portal, from Barber Booth
• 
  The western portal, near Malcoff
• 
  Airshaft, Colborne
• 
  In this picture, taken from Edale station, the eastern portal is seen beyond the departing Manchester-bound train. The route is still semaphore-signalled between Totley Tunnel East and Chinley signal boxes.