The region was formed in at nationalisation in 1948, mostly out of the former
Great Northern,
Great Eastern and
Great Central lines that were merged into the LNER in 1923. Of all the "Big Four" pre-nationalisation railway companies, the LNER was most in need of significant investment. In the immediate post-war period there was a need to rebuild the destroyed stations in London and along the busy East Coast Main Line and former
Great Central Railway. Additionally, the LNER had begun a suburban
electrification programme which the
British Transport Commission was pledged to continue. It was partially for this reason that the former LNER in England was divided into Eastern and North Eastern regions to focus investment, unlike the other English and Welsh regions that wholly took over their respective former companies' lines. In 1967 this policy was reversed and North Eastern was merged with the Eastern region. Over the years the region was recast to be geographical rather than being based upon pre-nationalisation ownership. In 1949 the Eastern Region gained the
London, Tilbury and Southend lines from the
London Midland Region. In a major national boundary change in 1958 the former Great Central network except those lines in
Yorkshire and
Lincolnshire transferred to the London Midland Region; in return the Eastern gained the former
LMS lines in
Lincolnshire and the present-day
South Yorkshire. In the 1960s the Eastern became one of the regions most affected by the
Beeching Axe, losing route miles in every county served and seeing the closure of previously important (but "duplicate") lines such as
Harrogate to Northallerton via Ripon. for Summer 1963. ways Eastern Region "totem" station sign for
Lincoln St Marks ==Network==