Changes

On 14 April 1951, a new grouping, or zone, called [[Southern Railway]] was formed from the merger of the [[Madras and Southern Mahratta Railway]], the [[South Indian Railway]] and the [[Mysore State Railway]]. This was followed in November 1951 by the creation of two further zones, [[Central Railway]] and [[Western Railway]]. Further mergers in 1952 took the total number of zones to 6 since when the number has grown to 16. These are shown below.