| Zone | Abbreviation | Route length (kms) | Headquarters |
|---|---|---|---|
| SER | South Eastern | 2631 | Kolkata |
| ER | Eastern | 2414 | Kolkata |
| SECR | South East Central | 2447 | Bilaspur |
| NFR | Northeast Frontier | 3907 | Guwahati |
| NR | Northern | 6968 | Delhi |
| NWR | North Western | 5459 | Jaipur |
| NCR | North Central | 3151 | Allahabad |
| CR | Central | 3905 | Mumbai |
| SR | Southern | 5098 | Chennai |
| ECR | East Central | 3628 | Hajipur |
| WR | Western | 6182 | Mumbai |
| KR | Konkan | 3782 | Mumbai |
| SWR | South Western | 3177 | Hubbali |
| SCR | South Central | 5803 | Secundrabad |
| WCR | West Central | 2965 | Jabalpur |
| NER | North Eastern | 3667 | Gorakhpur |
| ECoR | East Coast | 2572 | Bhubaneshwar |
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