British Rail DP2

DP2, short for Development Prototype number 2, was a one-off Type 4 mainline diesel locomotive built by English Electric at its Vulcan Foundry in Newton-le-Willows in 1962 to demonstrate its wares to British Railways. It was effectively the prototype for the later Class 50, trialling the engine and electronic systems used in that class. Externally it resembled a Class 55 Deltic because it used a modified Deltic bodyshell, but inside it had a single English Electric 16CSVT engine of 2,700 hp rather than the twin engines of the Deltics, a Co-Co wheel arrangement and a maximum speed of 90 mph. It ran trials, then regular services out of London Euston and later King's Cross, until 31 July 1967, when it was badly damaged in a collision with a derailed cement train at Thirsk. It was withdrawn in September 1967 and dismantled in 1968, its reusable parts going to the Class 50 spares pool.