In 1952, the Eastern Region of British Rail introduced its own series for departmental (non-revenue earning) vehicles, including locomotives. Numbers were allocated from 1 to 1000, with blocks of 100 numbers allocated to specific types of vehicle. This page only lists the locomotives (steam, diesel and electric), which took the number 1 to 100. This block was split as follows:

• 1-30 : Great Northern section (maintained at Doncaster)
• 31-50 : Great Eastern section (maintained at Stratford)
• 51-100: North Eastern section (maintained at Darlington)

This article does not cite any sources. (December 2009)

The Great Northern list later expanded to take numbers 31 and 32 from the Great Eastern list. Also included on this page is a former diesel locomotive that had been converted as a mobile power unit and numbered in the 9xx block used for miscellaneous vehicles.