Indian Railways is divided for administrative convenience into several regional railways. Until recently there were 9 zones, and this structure had not changed much for four decades. Recently, 7 new zones have been created, giving a total of 16.
The nine older railway zones and their headquarters are:
1} Northern Railway (NR) Delhi
2} North Eastern Railway (NER) Gorakhpur
3} Northeast Frontier Railway (NFR, sometimes NEFR) Guwahati
4} Western Railway (WR) Mumbai
5} Southern Railway (SR) Chennai
6} South Central Railway (SCR) Secunderabad
7} South Eastern Railway (SER) Kolkata
8} Eastern Railway (ER) Kolkata
9} Central Railway (CR) Mumbai
The 7 new zones and their headquarters are:
10} South Western Railway (SWR) Hubli
11} North Western Railway (NWR) Jaipur
12} West Central Railway (WCR) Jabalpur
13} North Central Railway (NCR) Allahabad
14} South East Central Railway (SECR) Bilaspur
15} East Coast Railway (ECoR) Bhubaneshwar
16} East Central Railway (ECR) Hajipur