Green Diesels in View LAST FEW COPIESGreen Diesels in View 21. 95 LAST FEW COPIES When British Railways took its first hesitant steps towards modernisation, it was probably disappointing for railway fans when the first main line diesel locomotives emerged in the black livery used on steam traction in the same power classification. Railway bosses must have had a change of heart in the mid 1950s because, on 19th August 1956, a party touring Derby works discovered Nos. 10000 and 10201