South Indian Railway Company
South Indian Railway map in 1910  | |
| Overview | |
|---|---|
| Headquarters | York Street, Westminster, London, UKGBI (R. O.) Trichinopoly, Madras Presidency, British Raj (Operations)  | 
| Reporting mark | SIR | 
| Locale | Madras Presidency | 
| Dates of operation | 1 July 1874–13 April 1951 (76 years, 9 months and 13 days)  | 
| Predecessor | Great Southern Railway of India Carnatic Railway  | 
| Successor | Southern Railway zone | 
| Technical | |
| Previous gauge | 1,000 mm (3 ft 3+3⁄8 in) | 
The South Indian Railway Company operated a number of 1,000 mm (3 ft 3+3⁄8 in) gauge lines in South India from 1874 to 1951.