British Railways "Britannia" Standard Class 7 No 70013 "Oliver Cromwell" was built at Crewe in 1951 and went on to spend most of its working life on passenger services around East Anglia. As diesel traction took over in the Eastern Region, Oliver Cromwell was transferred to the London Midland Region in 1963, and in 1968 became one of the locomotives that hauled what was at the time intended to be the last-ever steam train on the British mainline rail network.

Oliver Cromwell then passed into preservation and was moved to the Bressingham Steam Museum, first giving footplate rides to visitors over a short length of track within the museum ground, and later on static display.

In 2004, a programme of work began to restore Oliver Cromwell to mainline running condition. That programme was completed in 2008, since when the locomotive has been in much demand to haul steam specials around the country, including several excursions to its old territory around Norwich. Several concessions to the 21st century have been made, including the provision of electronic token equipment and "black box" recorders, as well as fittings on the tender to allow the attachment of fire hoses for rewatering.

The only other locomotive of this class to survive, out of 55 built, is the lead locomotive No. 70000 "Britannia". Britannia completed restoration at the Crewe Heritage Centre and returned to traffic in late 2010.