Indian Railways is divided into 17 zones, which are further sub-divided into divisions. The number of zones in Indian Railways increased from 6 to 8 in 1951, 9 in 1966 & 16 in 2003. Each zonal railway is made up of a certain no of divisions, each having a divisional headquarters. There are a total of 68 divisions. Each zone is headed by a general manager, who reports directly to the Railway Board. The zones are further divided into divisions, under the control of divisional railway managers (DRM). The divisional officers, of engineering, mechanical, electrical, signal and telecommunication, accounts, personnel, operating, commercial, security and safety branches, report to the respective Divisional Railway Manager and are in charge of operation and maintenance of assets. Further down the hierarchy tree are the station masters, who control individual stations and train movements through the track territory under their stations administration.
Major railways zones – Central Railway, Eastern Railway, Northern Railway, North Eastern Railway, Northeast Frontier Railway, Southern Railway, South Central Railway, South Eastern Railway, Western Railway, East Central Railway, East Coast Railway, North Central Railway, North Western Railway, South East Central Railway, South Western Railway, West Central Railway.