STD Codes
Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Mumbai CST H.Q. | 010 | 022 |
| Mumbai | 010 | 022 |
| Bhusaval | 011 | 02582 |
| Nagpur | 012 | 0712 |
| Pune | 013 | 020 |
| Solapur | 014 | 0217 |
Eastern Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Kolkata F.P. H.Q. | 020 | 033 |
| Howrah | 020 | 033 |
| Sealdah | 020 | 033 |
| Asansol | 020 | 0341 |
| Malda | 020 | 03512 |
Northern Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| N.Delhi B.H. H.Q. | 030 | 011 |
| Delhi | 030 | 011 |
| Firozpur | 031 | 01632 |
| Lucknow | 032 | 0522 |
| Moradabad | 033 | 0591 |
| Ambala | 034 | 0171 |
North Eastern Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Gorakhpur H.Q. | 040 | 0551 |
| Izzatnagar | 040 | 0581 |
| Lucknow | 040 | 0522 |
| Varanasi | 040 | 0542 |
Northeast Frontier Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Guwahati H.Q. | 050 | 0361 |
| Alipurduar | 050 | 03564 |
| Kathihar | 050 | 06452 |
| Lumding | 050 | 03674 |
| Rangia | 050 | 03621 |
| Tinsukia | 050 | 0374 |
Southern Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Chennai H.Q. | 060 | 044 |
| Chennai | 060 | 044 |
| Madurai | 060 | 0452 |
| Palghat | 060 | 0491 |
| Tiruchhirapalli | 060 | 0431 |
| Thiruvananthapuram | 060 | 0471 |
| Salem | 060 | 0427 |
South Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Secundrabad H.Q. | 070 | 040 |
| Secundrabad | 070 | 040 |
| Hyderabad | 070 | 040 |
| Guntkal | 070 | 08552 |
| Guntur | 070 | 0863 |
| Nanded | 070 | 02462 |
| Vijayawada | 070 | 0866 |
South Eastern Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Kolkata GRC H.Q. | 080 | 033 |
| Adra | 080 | 03251 |
| Chakradharpur | 080 | 06587 |
| Kharagpur | 080 | 03222 |
| Ranchi | 080 | 0651 |
Western Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Mumbai CG H.Q. | 090 | 022 |
| Mumbai | 090 | 022 |
| Vadodara | 091 | 0265 |
| Ratlam | 092 | 07412 |
| Ahmedabad | 093 | 079 |
| Rajkot | 094 | 0281 |
| Bhavnagar | 099 | 0278 |
East Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Hazipur H.Q. | 025 | 06224 0612 (PNBE) |
| Danapur | 025 | 06115 |
| Dhanbad | 025 | 0326 |
| Mughal Sarai | 025 | 05412 |
| Samastipur | 025 | 06274 |
| Sonpur | 025 | 06158 |
East Coast Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Bhuvneshwar H.Q. | 085 | 0675 |
| Khurda Road | 085 | 0674 |
| Waltair | 085 | 0891 |
| Sambhalpur | 085 | 0663 |
North Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Allahabad H.Q. | 035 | 0532 |
| Allahabad | 035 | 0532 |
| Agra | 036 | 0562 |
| Jhansi | 037 | 0510 |
North Western Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Jaipur H.Q. | 095 | 0141 |
| Jaipur | 095 | 0141 |
| Ajmer | 096 | 0145 |
| Bikaner | 097 | 0151 |
| Jodhpur | 098 | 0291 |
South East Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Bilaspur H.Q. | 075 | 07752 |
| Bilaspur | 075 | 07752 |
| Nagpur | 075 | 0712 |
| Raipur | 075 | 0771 |
South Western Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Hubli H.Q. | 065 | 0836 |
| Hubli | 065 | 0836 |
| Bengaluru | 065 | 080 |
| Mysore | 065 | 0821 |
West Central Railway
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| Jabalpur H.Q. | 015 | 0761 |
| Jabalpur | 015 | 0761 |
| Bhopal | 016 | 0755 |
| Kota | 017 | 0744 |
PRODUCTION UNITS
| Name of Zonal & Division Railways | Rly. Code | MTNL/BSNL Code |
| CLW-Chittranjan | 020 | 0341 |
| DLW-Varanasi | 043 | 0542 |
| DMW-Patiala | 0310 | 0157 |
| RCF-Kapurthala | 0319 | 01822 |
| ICF-Perambur | 060 | 044 |
| RWF-Bengaluru | 066 | 080 |
| RDSO-Lucknow | 0324 | 0522 |
| CORE-Allahabad | 035 | 0532 |
| Metro-Kolkata | 020 | 033 |
