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The London and North Eastern Railway (LNER) was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain. It existed from 1 January 1923 until nationalisation on 1 January 1948. It formed the new British Railways' Eastern Region, North Eastern Region and partially the Scottish Region.
The LNER was formed out of a number of constituent railway companies, the principal of which were:
The total route mileage was 6590 miles (10,605 km). The North Eastern Railway owned the largest mileage: 1757 route miles (2828 km), as compared with the North British Railway (1378 miles or 2218 km) and the Hull and Barnsley Railway, at 106.5 miles (171 km).
The LNER also owned:
docks and harbours in 20 locations, including the North East coast ports, some eastern Scottish ports, Harwich and London