BR Diesel Locomotives in Preservation Book by Fred Kerr

When British Railways (BR) initiated its Modernisation Plan in 1954 it had little experience of diesel locomotives thus initiated a Pilot Scheme to trial combinations of the three elements comprised within a locomotive the engine, transmission and body. The initial orders for 174 locomotives were placed in November 1955, but even before the first locomotive had been delivered, changes in Government policy led to bulk orders for most designs being trialled. It was only in 1968, once steam traction had been removed from the network, that BR was able to review the success, or otherwise, of its diesel fleet and decide which designs to withdraw from service. The nascent preservation movement of the time was concerned to preserve steam locomotives whilst only buying diesel shunting locomotives for support roles on heritage lines and it wasnt until 1977 that any effort was made to preserve main line diesels. Once it was confirmed that diesel locomotives had an appeal to enthusiasts, further purchases were made that resulted in examples of most of the BR diesel classes being represented within the preservation movement.