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The "Big Four" pre-nationalisation British railway companies v • d • e
Great Western • London Midland & Scottish • London & North Eastern • Southern
GWR constituents: Great Western Railway • Cambrian Railways • Taff Vale Railway Barry Railway • Rhymney Railway • (full list) LNER constituents: Great Central • Great Eastern • Great Northern • Great North of Scotland Hull & Barnsley • North British • North Eastern • (Full list) LMS constituents: Caledonian • Furness • Lancashire & Yorkshire • Glasgow & South Western London and North Western • Midland • North Staffordshire • (Full list) SR constituents: London and South Western Railway • London, Brighton and South Coast Railway South Eastern Railway • London, Chatham and Dover Railway • (Full list)
See also: History of rail transport in Great Britain 1923 - 1947 • List of companies involved in the grouping