| Constituents of the SOUTHERN RAILWAY |
| London Brighton and South Coast Railway | London and South Western Railway | South Eastern and Chatham Railway |
| Isle of Wight Railway 1863-1923 | Ryde Pier & Tramway 1877-1924 | Isle of Wight Central Railway 1887-1923 |
| Freshwater, Yarmouth & Newport Railway 1870-1923 | North Cornwall Railway 1882-1923 | Plymouth & Dartmoor Railway 1819-1923 |
| London & Greenwich Railway 1833-1923 | Mid Kent (Bromley & St. Mary Cray) Railway 1856-1923 | Victoria Station & Pimlico Railway Company 1858-1923 |
| Hayling Railways 1860-1923 | Sidmouth Railway 1871-1923 | Brighton & Dyke Railway 1877-1923 |
| Bridgewater Railway 1882-1923 | Lee-on-the-Solent Light Railway 1893-1923 | Lynton & Barnstaple Railway 1895-1923 |
| Totton, Hythe & Fawley Light Railway 1903-1923 | East London Railway 1865-1925 (to London Transport Executive in 1948) | Wimbledon & Sutton Railway 1910-1925 |
| West London Extension Railway (Joint with GWR, LMS) | Somerset & Dorset Railway Joint SR and LMS | |
