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:
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.
References
British Rail Eastern Region departmental locomotives Wikipedia(Text) CC BY-SA