British Railways (Eastern Region)

The Eastern Region (ER) of British Railways was a territorial Region from 1 January 1948 until the BR sectorisation of 1992. It inherited the LNER's southern territory, broadly the Great Northern, Great Eastern and Great Central systems south of the Humber and east of the Pennines, including the King's Cross–York leg of the East Coast Main Line.

The Eastern Region's flagship was the East Coast Main Line, which it operated jointly with the North Eastern Region (and from 1967 absorbed the NER outright). Notable Region projects included the Deltic (Class 55) diesel-electrics from 1961, the introduction of the InterCity 125 (HST) in 1978, and the East Coast electrification of 1985–1991.

The Region's territory was reorganised into the Network SouthEast and InterCity sectors during the 1980s and 1990s, and the geographic Region structure was formally abolished in 1992.