List of Railway Companies Involved in The 1923 Grouping - The Big Four

The Big Four

The Big Four and their constituent companies, showing route mileage, were:

• Great Western Railway (GWR)
  • Great Western Railway 3,005 miles (4,836 km)
  • Alexandra (Newport & S Wales) Docks & Railway (ADR) 10.5 miles (16.9 km)
  • Barry Railway (Barry) 68 miles (109 km)
  • Cambrian Railways (Cambrian) 295.25 miles (475.16 km)
  • Cardiff Railway (Cardiff) 11.75 miles (18.91 km)
  • Rhymney Railway (RhyR) 51 miles (82 km)
  • Taff Vale Railway (TVR) 124.5 miles (200.4 km)
    • for the list of subsidiary companies and joint railways see List of constituents of the Great Western Railway
• London and North Eastern Railway (LNER)
  • Great Central Railway (GCR) 852.5 miles (1,372.0 km)
  • Great Eastern Railway (GER) 1,191.25 miles (1,917.13 km)
  • Great Northern Railway (GNR) 1,051.25 miles (1,691.82 km)
  • Hull and Barnsley Railway 106.5 miles (171.4 km)
  • North Eastern Railway 1,757.75 miles (2,828.82 km)
  • Great North of Scotland Railway 334.5 miles (538.3 km)
  • North British Railway 1,378 miles (2,218 km)
    • for the list of subsidiary companies and joint railways see List of constituents of the London and North Eastern Railway
• London, Midland and Scottish Railway (LMS)
  • London and North Western Railway (LNWR); 2667.5 miles (4268 km)
    • including Lancashire and Yorkshire Railway (L&YR) amalgamated from 1 January 1922
  • Furness Railway(Furness); 158 miles (253 km)
  • Midland Railway (MR) 2170.75 miles (3473 km)
  • North Staffordshire Railway(NSR) 220.75 miles (253 km)
  • Caledonian Railway (CalR) 1114.5 miles (1783 km)
  • Glasgow and South Western Railway (GSWR) 493.5 miles (790 km)
  • Highland Railway(HR) 506 miles (807 km)
    • for the list of subsidiary companies and joint railways see List of constituents of the London, Midland and Scottish Railway
    • Irish Lines absorbed by the LMS were:
      • Dundalk, Newry and Greenore Railway(DNGR) 26.5 miles (42.6 km)
      • Northern Counties Committee lines (NCC(I)) 265.25 miles (426.88 km)
      • Joint Midland and Great Northern Railway (Ireland) lines (JtMGNR(I))
• Southern Railway (SR)
  • London, Brighton and South Coast Railway (LBSCR) 457.25 miles (735.87 km)
  • London and South Western Railway (LSWR) 1,020.5 miles (1,642.3 km)
  • South Eastern and Chatham Railways' Managing Committee: a working union of the South Eastern Railway and the London, Chatham and Dover Railway 637.75 miles (1,026.36 km)
    • for the list of subsidiary companies and joint railways see List of constituent companies of the Southern Railway