British Railways (Eastern Region)

The Eastern Region of British Railways was a territorial operating region from nationalisation on 1 January 1948 until the geographic regions were replaced by commercial sectors in 1992. It inherited the London and North Eastern Railway's southern territory — broadly the former Great Northern Railway, Great Eastern Railway, and Great Central Railway systems south of the Humber — including the southern half of the East Coast Main Line from King's Cross to York.

The Eastern Region's defining route was the East Coast Main Line, which it operated jointly with the North Eastern Region (absorbing the NER outright in 1967). The ER's locomotive history on the ECML was one of post-war Britain's most dramatic: the Gresley A4 Pacifics of the LNER era gave way to the Class 55 Deltic diesel-electrics from 1961 — the most powerful single-engined diesel locomotives in the world at their introduction — which in turn were replaced by the InterCity 125 HST from 1978. The East Coast electrification of 1985–1991 then brought the Class 91 electric locomotive and Mark 4 coaching stock, completing a sequence of traction evolution that paralleled the ECML's journey from steam to electric in three decades.

The National Railway Museum at York, opened in 1975, was established within the Eastern Region's territory and became the custodian of the national locomotive collection including several ECML express locomotives. The Region's territory passed at privatisation to Great North Eastern Railway, Anglia Railways, and other TOCs.