After the Hither Green rail crash, British Rail issued a directive that all locomotives should have an axle weight of no-more than 21 tons.
Locomotives were painted in colour schemes that would grab the attention of those seeing them in colour photographs and in films, which led to brightly coloured prototype diesel locomotives in the 1950s and 1960s such as the British Rail DP1 and HS 4000 'Kestrel'.
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