West German designs, the British-designed Class 14, Hymek and Western types; these were all eventually withdrawn and replaced with more standard British Rail diesel-electric classes such as the Class 37 and Class 47 upon the British Railways Board declaring diesel-hydraulic locomotives "non-standard" in an attempt to reduce costs. One of the major improvements on the Western Region, and later on the Eastern Region East Coast Main Line, was the introduction on the Great Western Main Line of the InterCity 125 trains in 1976/7 bringing major accelerations to the timetables. References Allen G. Freeman, The Western since 1948, Ian Allan (1979) British Rail regions