North British Type 2 B-B Diesel-Hydraulic Locomotives, BR Class 22 - Volume 1 - Setting the SceneNorth British Type 2 B B Diesel Hydraulic Locomotives, BR Class 22 Volume 1 Setting the Scene 28. 00 The British Railways Pilot Scheme orders of 1955 included six Type 2 diesel hydraulic locomotives built by the North British Locomotive Co., these being introduced during 1959 for use on the Western Region. Without operational experience, a further fifty two locomotives were delivered between 1959 and 1962. The fleet survived intact until 1968, when