and Wendover. On its journey through the Chilterns, the main line reaches a height of 390 ft at Tring summit. From the south, it ascends through a series of locks which follow the valleys of the rivers Gade and Bulbourne to reach Cowroast Lock. After a relatively short 3 mi summit, the canal starts its descent at Bulbourne, picking up the valley of the River Ouzel.

Each boat crossing the summit level draws off nearly 200000