Northern Railway (NR) North Eastern Railway (NER) Northeast Frontier Railway (NFR) Eastern Railway (ER) South Eastern Railway (SER) South Central Railway (SCR) Southern Railway (SR) Central Railway (CR) Western Railway (WR) South Western Railway (SWR) North Western Railway (NWR) West Central Railway (WCR) North Central Railway (NCR) South East Central Railway (SECR) East Central Railway (ECR) East Coast Railway (ECoR) Konkan Railway (KR) Metro Railway, Kolkata (MR)
