List of constituents of the London, Midland and Scottish Railway.html

Constituent companies

Caledonian Railway (CalR) 1114.5 route miles (1794 km)
Furness Railway (Furness) 158 miles (254 km)
Glasgow and South Western Railway 493.5 miles (794 km)
Highland Railway(HR) 506 miles (814 km)
London and North Western Railway (LNWR) - with which the Lancashire and Yorkshire Railway (L&YR) had been amalgamated on 1 January 1922. Total route mileage (1923) was 2667.5 miles (4293 km)
Midland Railway (MidR) 2170.75 miles (3473 km)
North Staffordshire Railway (NSR) 220.75 miles (355 km)

Independently operated lines

Cleator and Workington Junction Railway 30.5 miles (49 km) (partially worked by the Furness Railway)
Knott End Railway 11.5 miles (19 km)
Maryport and Carlisle Railway 42.75 miles (68.8 km)
North London Railway 16 miles (26 km) (managed by the LNWR)
Stratford-upon-Avon and Midland Junction Railway 67.5 miles (109 km)
Wirral Railway 13.75 miles (22 km)

Independent lines for which rolling stock was provided by other companies

Non-working companies

Originally leased to or worked by LNWR
- Charnwood Forest Railway 10.5 miles (17 km)
- Dearne Valley Railway 21 miles (34 km)
- Harborne Railway 2.5 miles (4 km)
- Mold and Denbigh Junction Railway 15 miles (24 km)
- Shropshire Union Railways and Canal Company 29.25 miles (47 km) [part of this system was jointly leased with the Great Western Railway (GWR)]
Originally leased to or worked by MidR
- Tottenham and Forest Gate Railway 6 miles (10 km)
- Yorkshire Dales Railway 9 miles (14 km)
Originally leased to or worked by CalR
- Arbroath and Forfar Railway 14.75 miles (24 km)
- Brechin and Edzell District Railway 6.25 miles (10 km)
- Callander and Oban Railway 99.75 miles (161 km)
- Dundee and Newtyle Railway 14.5 miles (23 km)
- Killin Railway 5.25 miles (8 km)
- Lanarkshire and Ayrshire Railway 36.25 miles (58 km)
- Solway Junction Railway 12.25 miles (20 km)
Originally leased to or worked by HR
- Dornoch Light Railway 7.75 miles (12 km)
- Wick and Lybster Light Railway 13.5 miles (22 km)
Originally leased to or worked by NSR
- Leek and Manifold Valley Light Railway (narrow gauge) 8.25 miles (13 km)
Originally leased to or worked by several component companies
- North & South Western Junction Railway 5.25 miles (8 km)
- Portpatrick & Wigtownshire Joint Railway 82.25 miles (132 km)

Dundalk, Newry and Greenore Railway 26.5 miles (43 km) - operated from 1933 by the GNR(I)
Northern Counties Committee's lines 265.25 miles (427 km)
Joint Midland and Great Northern of Ireland 91 miles (146 km)
County Donegal Railways Joint Committee (owned jointly with the Great Northern Railway of Ireland)

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 • 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 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