North British Type 2 B-B Diesel-Hydraulic Locomotives, B R Class 22 - Volume 2 - Detailed InsightsNorth British Type 2 B B Diesel Hydraulic Locomotives, B R Class 22 Volume 2 Detailed Insights 28. 00 The British Railways Pilot Scheme orders of 1955 included six North British Type 2 diesel hydraulic locomotives, 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 half of the class was