Railway Terminology and Abbreviations
PNR, RAC, WL, TT, RPF, GRP, NTES, CRIS, KAVACH, OHE — full glossary.
Railway Terminology and Abbreviations — Core
PNR, RAC, WL, TT, RPF, GRP, NTES, CRIS, KAVACH, OHE — full glossary.
KEY RAILWAY ABBREVIATIONS:
Operational / Booking:
| Acronym | Meaning |
|---|---|
| PNR | Passenger Name Record (booking ref) |
| RAC | Reservation Against Cancellation |
| WL | Wait List |
| CNF | Confirmed |
| TQ | Tatkal Quota |
| GNWL | General Wait List |
| RLWL | Remote Location Wait List |
| RSWL | Roadside Wait List |
| PQWL | Pooled Quota Wait List |
| CK | Tatkal Quota |
| HO | Head Office Quota |
| LD | Ladies Quota |
| HP | Handicapped Quota |
| SS | Senior Citizen Quota |
| FN | Foreign Tourist Quota |
| ETKT | E-Ticket |
| ITKT | I-Ticket (delivered physically) |
Train Operations:
| Acronym | Meaning |
|---|---|
| LP | Loco Pilot |
| ALP | Asst Loco Pilot |
| GD | Goods Driver |
| TT / TTE | Travelling Ticket Examiner |
| ASM | Asst Station Master |
| SS | Station Superintendent |
| SM | Station Manager |
| GG | Goods Guard |
| TM | Train Manager |
| OBS | On-Board System |
| OHE | Overhead Equipment (electric wire) |
| TRD | Traction Distribution |
| TPC | Traction Power Controller |
Security:
| Acronym | Meaning |
|---|---|
| RPF | Railway Protection Force |
| GRP | Government Railway Police (state police) |
| RPSF | Railway Protection Special Force |
| CRS | Commissioner of Railway Safety |
Other Organisations / Systems:
| Acronym | Meaning |
|---|---|
| NTES | National Train Enquiry System |
| CRIS | Centre for Railway Information Systems |
| UTS | Unreserved Ticketing System |
| HRMS | Human Resources Management System |
| CC | Catering & Commercial |
| FNS | Freight Operations Information System |
| FOIS | Freight Operations Info System |
| ITMS | Integrated Train Mgmt System |
| KAVACH | Indigenous Train Collision Avoidance System |
| RTSA | Rail Travel Service Agent |
| IRRMS | Indian Railway Resource Management System |
| EBOX | Electronic Box (signaling) |
INFRASTRUCTURE TERMS:
Track: the rails on which train runs.
Sleeper: the horizontal beams (now usually concrete; earlier wood).
Ballast: the crushed stones supporting sleepers.
Gauge: distance between two rails.
- Broad Gauge (BG): 1676 mm — Indian standard.
- Metre Gauge (MG): 1000 mm — mostly converted.
- Narrow Gauge (NG): 762/610 mm — only mountain railways.
OHE (Overhead Equipment): wire above tracks supplying 25 kV AC.
Catenary: the suspended OHE wire system.
Pantograph: the device on top of electric loco contacting OHE.
Signal: indicates whether train can proceed.
Token: old physical authority for single-line working (now replaced by token-less).
Block: section of track between two signals.
Loop line: secondary track at stations for crossing/overtaking.
Yard: area for marshalling/parking trains.
Carriage Shed: maintenance facility for coaches.
Loco Shed: maintenance for locomotives.
TRAIN TYPES (terminology):
- Mail/Express: standard inter-city trains.
- Superfast Express: higher average speed (55+ km/h).
- Passenger / Local: slow, all stops.
- Suburban: in metropolitan areas (EMU/MEMU).
- EMU: Electric Multiple Unit — self-propelled local.
- MEMU: Mainline EMU — longer-distance local.
- DEMU: Diesel EMU — for non-electrified routes.
- Tourist train: luxury / special itinerary (Maharajas, Palace on Wheels).
OPERATIONAL CONCEPTS:
- Coaching stock: passenger coaches/coaches incl. parcel vans.
- Goods stock: wagons.
- Rake: a rake = set of coaches forming a train. Usually 22-24 coaches.
- Composition: the number/type of coaches in a rake.
- Halt: small station with limited services.
- Junction: station where 3+ routes meet.
- Terminus: end of line (e.g., CSMT, HWH).
TIME TABLE TERMS:
- ETA: Estimated Time of Arrival.
- ETD: Estimated Time of Departure.
- NTES: real-time updates.
- Daily, Weekly, Bi-weekly: frequency.
- Permanent, Special: running status.
PRICING TERMS:
- Base fare: fixed per km.
- Reservation charge: booking fee.
- Tatkal charge: premium for last-minute.
- Superfast surcharge: for superfast trains.
- Dynamic pricing: demand-based (rare; for some Rajdhani/Tejas).
- Cancellation charge: depends on time before departure.
SAFETY / SIGNALLING:
- ATP (Automatic Train Protection): prevents train passing red signal.
- KAVACH: indigenous ATP system (developed by RDSO).
- TCAS: Train Collision Avoidance System (older name for KAVACH).
- ABS (Automatic Block Signaling).
- MACLS (Modified Automatic Centralized Lighting Signaling).
- CTC (Centralized Traffic Control).
- TPWS (Train Protection Warning System).
EXAM HOOKS:
- PNR is unique 10-digit booking reference.
- RAC vs WL: RAC = part-confirmed (you'll get a seat); WL = waitlisted.
- OHE = 25 kV AC for traction.
- KAVACH = indigenous ATP system; replacing TCAS.
- Pantograph: device on loco roof for current pickup.
- Gauge: BG (1676 mm) is standard; almost all Indian rail is BG now.
- TTE/TT: ticket examiner on trains.
- NTES: free train info via app/website.