We have added some new content to our 'Diesel Era' pages, this time looking back to the late 1950s, when as part of their modernisation plan, British Railways carried out a series of main line tests with a prototype diesel electric locomotive - ‘Deltic’ which had been built by English Electric. The production fleet that followed as a result of these tests came into operation from 1961 onwards, taking over a variety of steam hauled services. They were initially numbered D9000 to D9021 and transformed express services to and from London King’s Cross along the ECML. Later they were renumbered with the class prefix - 55, but we still referred to them as 'Deltics'. Our aim here is to only provide a brief potted history of the class, thus providing a starting point for specific 'Grantham related' 'Deltic' stories that will follow in the future. You can read more here.