| 1 | ABS | Automatic Block System |
| 2 | ACD | Anti-Collision Device |
| 3 | ACP | Alarm Chain Pulling |
| 4 | ADRM | Additional Divisional Railway Manager |
| 5 | AOM | Assistant Operations Manager |
| 6 | ART | Accident Relief Train |
| 7 | ARME | Accident Relief Medical Equipment |
| 8 | ASM | Assistant Station Master |
| 9 | AWS | Auxiliary Warning System |
| 10 | BPAC | Block Proving Axle Counter |
| 11 | BPC | Brake Power Certificate |
| 12 | BSL | Block Section Limit |
| 13 | BWM | Block Working Manual |
| 14 | CCC | Chief Crew Controller |
| 15 | COA | Control Office Application |
| 16 | COIS | Coaching Operations Information System |
| 17 | DFC | Dedicated Freight Corridor |
| 18 | DRM | Divisional Railway Manager |
| 19 | FOIS | Freight Operations Information System |
| 20 | GR | General Rules |
| 21 | GTKM | Gross Tonne Kilometre |
| 22 | IBP | Intermediate Block Post |
| 23 | NTES | National Train Enquiry System |
| 24 | ODC | Over Dimensional Consignment |
| 25 | PCOM | Principal Chief Operations Manager |
| 26 | RMC | Railway Material Consignment |
| 27 | RMS | Rake Management System |
| 28 | RRI | Route Relay Interlocking |
| 29 | SWR | Station Working Rules |
| 30 | TMS | Terminal Management System |
| 31 | AEE | Assistant Electrical Engineer |
| 32 | AEN | Assistant Engineer |
| 33 | AFTO | Assistant Freight Transportation Officer |
| 34 | AM | Area Manager |
| 35 | APO | Assistant Personnel Officer |
| 36 | ARL | Annual Review List |
| 37 | ATM | Assistant Traffic Manager |
| 38 | BC | Block Control |
| 39 | BCC | Base Crew Controller |
| 40 | BCT | Block Control Telephone |
| 41 | BDR | Block Diagram Register |
| 42 | BLC | Container Flat Wagon |
| 43 | BPC | Brake Power Certificate |
| 44 | BS | Block Station |
| 45 | BT | Block Ticket |
| 46 | C&W | Carriage and Wagon |
| 47 | CAO | Chief Administrative Officer |
| 48 | CC | Chief Controller |
| 49 | CCM | Chief Commercial Manager |
| 50 | CDE | Chief Design Engineer |
| 51 | CE | Chief Engineer |
| 52 | CME | Chief Mechanical Engineer |
| 53 | CMPE | Chief Motive Power Engineer |
| 54 | COM | Chief Operations Manager |
| 55 | COS | Controller of Stores |
| 56 | CPTM | Chief Passenger Transportation Manager |
| 57 | CR | Central Railway |
| 58 | CRE | Chief Rolling Stock Engineer |
| 59 | CRIS | Centre for Railway Information Systems |
| 60 | CSMT | Chhatrapati Shivaji Maharaj Terminus |
| 61 | CSTE | Chief Signal and Telecommunication Engineer |
| 62 | CTO | Chief Transportation Officer |
| 63 | CVI | Chief Vigilance Inspector |
| 64 | D&AR | Discipline and Appeal Rules |
| 65 | DCM | Divisional Commercial Manager |
| 66 | DE | Divisional Engineer |
| 67 | DEN | Divisional Engineer |
| 68 | DFM | Divisional Finance Manager |
| 69 | DME | Divisional Mechanical Engineer |
| 70 | DOM | Divisional Operations Manager |
| 71 | DOS | Divisional Operating Superintendent |
| 72 | DPO | Divisional Personnel Officer |
| 73 | DSTE | Divisional Signal and Telecommunication Engineer |
| 74 | DTO | Divisional Transportation Officer |
| 75 | ECR | East Central Railway |
| 76 | ECOR | East Coast Railway |
| 77 | ED | Executive Director |
| 78 | EMU | Electric Multiple Unit |
| 79 | ER | Eastern Railway |
| 80 | ET | Emergency Telephone |
| 81 | FA&CAO | Financial Advisor and Chief Accounts Officer |
| 82 | FOIS | Freight Operations Information System |
| 83 | FR | Fundamental Rules |
| 84 | G&SR | General and Subsidiary Rules |
| 85 | GM | General Manager |
| 86 | HOD | Head of Department |
| 87 | HQA | Headquarters Administration |
| 88 | ICF | Integral Coach Factory |
| 89 | IR | Indian Railways |
| 90 | IRCTC | Indian Railway Catering and Tourism Corporation |
| 91 | IRCON | Indian Railway Construction Company |
| 92 | IRSEE | Indian Railway Service of Electrical Engineers |
| 93 | IRSME | Indian Railway Service of Mechanical Engineers |
| 94 | IRTS | Indian Railway Traffic Service |
| 95 | LHB | Linke Hofmann Busch |
| 96 | MEMU | Mainline Electric Multiple Unit |
| 97 | NCR | North Central Railway |
| 98 | NER | North Eastern Railway |
| 99 | NFR | Northeast Frontier Railway |
| 100 | NR | Northern Railway |
| 101 | NWR | North Western Railway |
| 162 | OS | Operating Superintendent |
| 103 | PCE | Principal Chief Engineer |
| 104 | PCME | Principal Chief Mechanical Engineer |
| 105 | PCOM | Principal Chief Operations Manager |
| 106 | PCSC | Principal Chief Security Commissioner |
| 107 | PCSTE | Principal Chief Signal & Telecommunication Engineer |
| 108 | PET | Passenger Emergency Telephone |
| 109 | PFT | Private Freight Terminal |
| 110 | PR | Public Relations |
| 111 | PU | Production Unit |
| 112 | RDSO | Research Designs and Standards Organisation |
| 113 | RO | Road Over Bridge |
| 114 | RPC | Railway Protection Force |
| 115 | RRC | Railway Recruitment Cell |
| 116 | RRB | Railway Recruitment Board |
| 117 | RSI | Railway Safety Inspector |
| 118 | RU | Road Under Bridge |
| 119 | RVNL | Rail Vikas Nigam Limited |
| 120 | SCR | South Central Railway |
| 121 | SCRE | South Central Railway Engineer |
| 122 | SECR | South East Central Railway |
| 123 | SER | South Eastern Railway |
| 124 | SR | Southern Railway |
| 125 | SS | Station Superintendent |
| 126 | SWR | Station Working Rules |
| 127 | TCO | Traffic Control Office |
| 128 | TI | Traffic Inspector |
| 129 | TM | Traffic Manager |
| 130 | TMS | Track Management System |
| 131 | TRD | Traction Distribution |
| 132 | TRS | Traction Rolling Stock |
| 133 | TT | Time Table |
| 134 | TTE | Travelling Ticket Examiner |
| 135 | VDU | Visual Display Unit |
| 136 | WCR | West Central Railway |
| 137 | WR | Western Railway |
| 138 | YTD | Yard Traffic Department |
| 139 | ZCC | Zonal Crew Controller |
| 140 | ZR | Zonal Railway |
| 141 | ZTC | Zonal Training Centre |
| 142 | ACM | Assistant Commercial Manager |
| 143 | ADEN | Assistant Divisional Engineer |
| 144 | ADSTE | Assistant Divisional Signal & Telecommunication Engineer |
| 145 | AFA | Assistant Financial Advisor |
| 146 | AM | Additional Member |
| 147 | AMM | Assistant Material Manager |
| 148 | CAO/C | Chief Administrative Officer/Construction |
| 149 | CBE | Chief Bridge Engineer |
| 150 | CCE | Chief Commercial Engineer |