Prototype diesel shunting locomotives built in 1956 by English Electric at its Vulcan Foundry in Newton-le-Willows to demonstrate its wares to British Railways. They originally carried numbers D226 and D227, their Vulcan Foundry works numbers, but these were amended in August 1959 to D0226/D0227 to avoid clashing with the numbers of new Class 40 locomotives. This was the Diesel Electric transmission version.

Photo: J.F. Davies/Rail Archive Stephenson