Indian Railways is geographically organized into zones. At present there are 17 Zonal Railways (including Metro Railway, Kolkata).
|1||Central (CR)||3905||Mumbai||Mumbai, Bhusawal, Pune, Solapur, Nagpur|
|2||East Central (ECR)||3628||Hajipur||Danapur, Dhanbad, Mughalsarai, Samastipur, Sonpur|
|3||East Coast (ECoR)||2572||Bhubaneswar||Khurda Road, Sambalpur, Visakhapatnam|
|4||Eastern (ER)||2414||Kolkata||Howrah, Sealdah, Asansol, Malda|
|5||North Central (NCR)||3151||Allahabad||Allahabad, Agra, Jhansi|
|6||North Eastern (NER)||3667||Gorakhpur||Izzatnagar, Lucknow, Varanasi|
|7||North Western (NWR)||5459||Jaipur||Jaipur, Ajmer, Bikaner, Jodhpur|
|8||Northeast Frontier (NFR)||3907||Guwahati||Alipurduar, Katihar, Rangia, Lumding, Tinsukia|
|9||Northern (NR)||6968||Delhi||Delhi, Ambala, Firozpur, Lucknow, Moradabad|
|10||South Central (SCR)||5803||Secunderabad||Secunderabad, Hyderabad, Guntakal, Guntur, Nanded, Vijayawada|
|11||South East Central (SECR)||2447||Bilaspur||Bilaspur, Raipur, Nagpur|
|12||South Eastern (SER)||2631||Kolkata||Adra, Chakradharpur, Kharagpur, Ranchi|
|13||South Western (SWR)||3177||Hubli||Hubli, Bangalore, Mysore|
|14||Southern (SR)||5098||Chennai||Chennai, Tiruchirappalli, Madurai, Palakkad, Salem, Trivandrum|
|15||West Central (WCR)||2965||Jabalpur||Jabalpur, Bhopal, Kota|
|16||Western (WR)||6182||Mumbai||Mumbai Central, Ratlam, Ahmedabad, Rajkot, Bhavnagar, Vadodara|
Each zone is under the control of General Manager (GM) who is responsible for its operation, maintenance and financial position. GM is assisted by an Additional General Manager (AGM) and Heads of Department (HoD) for various Departments viz, Transportation, Commercial, Accounts, Personnel, Civil Engineering, Mechanical Engineering, Electrical Engineering, Signal & Telecommunications, Stores, Medical and Security. In departments where more than one HoD is provided one of the HODs is nominated as co-ordinating HoD. For example in Transportation, there are many HOD like Chief Freight Traffic Manager(CFTM), Chief Passenger Traffic Manager(CPTM) etc., but COM is nominated as co-ordinating HoD.
Each zone is further classified into Divisions geographically. Divisions are the basic unit of operation. Division is headed by a Divisional Railway Manager who is in the rank of an HoD. At present there 68 Divisions in Indian Railways.
A Railway Division is the smallest administrative Unit of Railways.