Indian Railways is divided into 16 zones :
- Northern Railway (NR)
- North Eastern Railway (NER)
- Northeast Frontier Railway (NFR)
- Western Railway (WR)
- Southern Railway (SR)
- South Central Railway (SCR)
- South Eastern Railway (SER)
- Eastern Railway (ER)
- Central Railway (CR)
- South Western Railway (SWR)
- North Western Railway (NWR)
- West Central Railway (WCR)
- North Central Railway (NCR)
- South East Central Railway (SECR)
- East Coast Railway (ECoR)
- East Central Railway (ECR)