The 309 members of the class 37 underwent many changes in their long career on British railways. Under the TOPS system each change was reflected in a change of identity. This table attempts to catalogue those changes. Fleet list See also British Rail Class 37#Preservation for details, including liveries, of preserved locomotives Notes References Bibliography Ian Allan ABC of British Motive Power, several editions British Rail Locomotives, Platform 5, several editions Today's Railways monthly updates, Platform 5 Kenny Barclay, British Rail in the 1980s and 1990s: Diesel Locomotives and DMUs, Amberley Publishing Limited, 2017 . Andrew Walker, Class 37 Locomotives, Amberley Publishing Limited, 2016 . 37 renumber British railway-related lists English Electric locomotives