Acronyms and Abbreviations - I
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Acronyms and Abbreviations
Q. What does "NRM" stand for? "CLW"? Etc. etc.
Note: Station codes can be found in the section on railway stations. Below are lists of the most common IR-related acronyms.
| Trains | |
|---|---|
| AP | Andhra Pradesh Express |
| DQ | The Deccan Queen |
| GT | Grand Trunk Express |
| JJ | Jayanti Janata Express |
| KK | Karnataka-Kerala Express |
| TN | Tamil Nadu Express |
| POW | Palace on Wheels |
| Technical acronyms (loosely defined — see the miscellaneous section also.) | |
|---|---|
| ABS | Automatic Block Signalling |
| ACD | Anti-Collision Device |
| ADAM | ARTS Data Manager (system for managing EPROMs and station configuration cartridges for ARTS) |
| AE | Automatic Emergency or Auto-Emergency (type of brake system) |
| AFTC | Audio Frequency Track Circuiting |
| ATC | Automated Train Control |
| ATP | Automatic Train Protection |
| ATS | Automatic Train Stop |
| AVB | Automatic Vacuum Brake |
| ATS | Automatic Train Stop |
| BPC | Brake Power Certificate (issued before train departure) |
| BS | Braking in Series configuration |
| BSL | Block Section Limit |
| BSP | Braking in Series-Parallel configuration |
| CDO | Coaching Depot |
| CLS | Colour-light signalling |
| COCR | Confirmatory Oscillograph Car Run |
| COFC | Container on flat car |
| CTC | Centralised Traffic Control |
| CTR | Complete Track Renewal |
| CWR | Continuous Welded Rail (0.5km and longer sections of welded rail) |
| DAC | Digital Axle Counter |
| DBFO | Design-Build-Finance-Operate (a scheme for private parties to build and run railway lines with IR's help) |
| DJ | From the French disjoncteur, the main circuit breaker of an electric loco (usually pneumatically operated, roof-mounted) |
| DLBI | Double Line Block Instrument |
| DEMU | Diesel-Electric Multiple Unit |
| DETC | Diesel-Electric Tower Car |
| DHMU | Diesel Hydraulic Multiple Unit (hydraulic transmission DMU) |
| DMH | Dead Man's Handle (on EMUs) |
| DMU | Diesel Multiple Unit |
| DPC | Driving Power Car |
| DS | Disconnecting Switch (to switch off OHE power to loco circuits, usually manual) |
| DSC | Dual-Stacked Container service (or Double-Stacked Container) |
| DTC | Driving Trailer Car (unpowered driving car in EMU rake) |
| DW | Double wire (of semaphore signals) |
| EA | Extra (time) Allowed (make-up time noted in working time-tables) |
| ELCM | Electronic Load Control Module (governor for DEMUs and other diesels). |
| EMU | Electric Multiple Unit |
| EOG | End-On Generator Car |
| ETCS | European Train Control System |
| EY | Empty (notation for empty rake in real-time train information systems) |
| FEDL | Fully Electrified Double Line |
| FM | Fouling Mark |
| FMVFT | Frequency-modulated Voice-frequency Telegraph (used for control communications by signals / electric traction / traffic control staff) |
| FOR | Forward motion (position of master controller in loco) |
| FP | Fouling Point; also Feed Pipe (at couplings of vehicles) |
| GTO | Gate Turn-Off thyristor |
| HEP | Head-end Power (power from the loco for the coaches) |
| HFTC | High-Frequency Track Circuit |
| HOBC | High-Output Ballast Cleaner |
| HOG | Head-On Generator |
| HHPDMU | High-Horsepower Diesel Electric Multiple Unit |
| HPDMU | High-powered Diesel Multiple Unit |
| HSCB | High-speed Circuit Breaker |
| HT | High Tension |
| HTCBC | High Tensile-strength Centre-Buffer Coupler |
| HTS | High Tensile-strength Steel |
| IGBT | Insulated Gate Bipolar Transistor |
| JRI | Junction Route Indicator |
| LOB | Lube Oil Balance |
| LTPDS | Live Train Position Display System |
| LVC | Last Vehicle Check (automated detection of rake integrity) |
| LWR | Long Welded Rail (5-15 rails welded together in a section) |
| MACL, MACLS | Multiple-Aspect Colour-Light signalling |
| MCB | Master Circuit Breaker (in locos) |
| MCI | Malleable Cast Iron |
| MEMU | Main-line Electric Multiple Unit |
| MLRI | Multi-Lamp Route Indicator |
| MNI | Modified Non-Interlocked (in working timetables) |
| MOG | Mid-On Generator Car |
| MOT | Motoring (position of master controller in loco) |
| NBT | Neale's Ball Token |
| NI | Non-Interlocked (in working timetables) |
| NTES | National Train Enquiry System |
| NX | eNtrance-eXit (interlocking panels) |
| OCV | Other Coaching Vehicle - non-passenger coaches, e.g., pantry cars. |
| OFC | Optical Fibre Cable |
| OHE | Overhead Equipment (or foreman for same) |
| OMS | Oscillation Monitoring System |
| PCS | Pneumatic Control System (loco shut-off/idling control which takes effect on application of emergency brakes) |
| PCV | Passenger Carrying Vehicle (regular passenger coaches, as distinct from OCV - restaurant cars, mail cars, etc.) |
| PI | Panel Interlocking |
| POET | Passenger Operated Enquiry Terminal |
| RCC | Remote Control Centre (for electric traction) Also, Reinforced Cement Concrete (Also see below in Miscellaneous) |
| REV | Reverse motion (position of master controller in loco), Reverser |
| ROSHAN | Rolling Stock Health Analyst (accelerometers and other equipment that monitor coach movement and report deviations from normal behaviour). |
| RPC | Resistance Power Control (or Compartment) (in EMU power cars) |
| SCADA | Supervisory Control and Data Acquisition (monitoring and control system for remote control of electric traction systems) |
| SE | Superelevation (of curved track) |
| S/L | Shunting Limit |
| SLBI | Single Line Block Instrument |
| SOD | Schedule of Dimensions |
| SPAD | Signal Passed At Danger |
| SPTM | Self-Printing Ticket Machine |
| SSDAC | Solid State Digital Axle Counter |
| SSI | Solid State Interlocking |
| STR | Schedule of Technical Requirements |
| STRI | Stencil type Route Indicator |
| SW | Single wire (of semaphore signals) |
| SWR | Short Welded Rail (2-4 rails welded together in a section) Also: Station Working Rules |
| TAB | Train Air Brake |
| TALQ | Two-Aspect Lower Quadrant |
| TAWD | Train Actuated Warning Device |
| TBTR | Through Bridge Timber Renewal |
| TFR | Through Fitting Renewal |
| TLC | Traction Locomotive Controller |
| TM | Traction Motor |
| TMS | Train Management System (train monitoring used in Bombay suburban sections) |
| TOFC | Trailer on flat car |
| T/out | Turnout |
| TPC | Traction Power Controller |
| TRC | Track Recording Car |
| TRO | Traction Rolling-stock Operations |
| TRR | Through Rail Renewal |
| TRT | Traffic Recovery Time (a kind of make-up time allotment in working timetable) |
| TSS | Traction Sub-Station |
| TSR | Through Sleeper Renewal |
| TTR | Through Turnout Renewal |
| TWR | Through Weld Renewal |
| UPF | Unity Power Factor |
| USFD | Ultrasonic Flaw Detection |
| VCC | Vacuum Continuity Certificate (issued before train departure) |
| VCB | Vacuum Circuit Breaker |
| VRP | Voltage Regulating Panel |
| WF | Weak Field |
| WILD | Wheel Impact Load Detector |
| WSR | Wheel Slip Relay |
More acronyms and abberviations in the next page.