Foudation of various zones:
1. Central CR 05-11-1951
2. East Central ECR 01-10-2002
3. East Coast ECoR 01-04-2003
4. Eastern ER 04-1952
5. North...
more... Central NCR 01-04-2003
6. North Eastern NER 1952
7. North Western NWR 01-10-2002
8. Northeast Frontier NFR 15-01-1958
9. Northern NR 14-04-1952
10. South Central SCR 02-10-1966
11. South East Central SECR 01-04-2003
12. South Eastern SER 1955
13. South Western SWR 01-04-2003
14. Southern SR 14-04-1951
15. West Central WCR 01-04-2003
16. Western WR 05-11-1951
17. Metro Railway, Kolkata MR 31-12-2010