The Southern Railway (abbreviated SR), headquartered at Chennai, is one of the 19 zones of Indian Railways. It is the earliest of the 19 zones of the Indian Railways created in independent India. It was created on 14 April 1951 by merging three state railways, namely, the Madras and Southern Mahratta Railway, the South Indian Railway Company, and the Mysore State Railway. The South Indian Railway was originally created in the British colonial times as Great Southern of India Railway Co founded in Britain in 1853 and registered in 1859. Its original headquarters was in Tiruchirappalli (Trichy) and was registered as a company in London only in 1890. At present, after re-organization of existing railway zones and creation of new zones undertaken by the Indian Railways between 2002 and 2003, Southern Railway has emerged as the 4th largest zone after undertaking some gauge conversion projects and creation of new lines. The trains operated by the southern railway are rated the cleanest as well as cleanly maintained trains of the Indian Railways. History In 1944, all Railway companies were taken over by the Government. And three years later, when India woke up to independence in 1947, the stage was set for the integration of different Railways into smaller zones. In 1948, immediately after independence, there were as many as 42 different railway systems – a multiplicity of railway administrations, varying in size and standards. The regrouping proposals put forward by the various committees were studied in great detail to ensure that a unification could be achieved with the least disturbance and dislocation. Important associations of railway-users, Chambers of Commerce and Industry, the State Governments and acknowledged experts both in India and abroad were fully consulted. N. Gopalaswami Ayyangar, the then Minister for Railways, was the principal architect of the regrouping of Indian Railways. In December 1950, the Central Advisory Committee for Railways approved the plan for Indian Railways into six Zonal systems, namely, the Northern, the North-Eastern, the Southern, the Central, the Eastern and the Western. The Southern Railway zone was the first zone to be formed. Created on 14 April 1951 by the merger of the Madras and Southern Mahratta Railway, the South Indian Railway and the Mysore State Railway, the economic and geographical factors of this zone facilitated an early integrated network. This amalgamation was a major step towards streamlining and organizing the working pattern of the Railway system.