(UTC) 

 *As you say the "Type 4s" became Class 40. Most of the people I knew called these "DP2s" as they were based on that prototype. Names such as "Hoovers" were introduced by a new generation of train-spotters, but I don't know if they ever became popular with older fans who stuck with the titles given in the Ian Allan "Combineds".Williamgeorgefraser 15:06, 29 December 2012