London, Midland and Scottish Railway

The London, Midland and Scottish Railway (LMS) was one of the Big Four British railway companies from 1923 to 1948. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railways into four. The companies merged into the LMS included the London and North Western Railway, the Midland Railway, the Lancashire and Yorkshire Railway (which had previously merged with the London and North Western Railway on 1 January 1922), several Scottish railway companies (including the Caledonian Railway), and numerous other, smaller ventures.

For the Modern Company, see London Midland.

v t e The "Big Four" pre-nationalisation British railway companies
Great Western London Midland & Scottish London & North Eastern Southern
GWR constituents	Alexandra (Newport and South Wales) Docks and Railway Barry Railway Cambrian Railways Cardiff Railway Great Western Railway Rhymney Railway Taff Vale 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 Glasgow & South Western Highland Lancashire & Yorkshire London and North Western Midland North Staffordshire Full list
SR constituents	London and South Western Railway London, Brighton and South Coast Railway London, Chatham and Dover Railway South Eastern and Chatham Railway South Eastern Railway Full list
See also History of rail transport in Great Britain 1923–1947 List of companies involved in the grouping