Technical Acronyms of Indian Railways

List of Technical acronyms and abbreviation related to India Railways

Acronyms/Abbreviation	Full Form of Acronyms/Abbreviation
ABS	Automatic Block Signalling
ACD	Anti-Collision Device
ADAM	ARTS Data Manager (system for managing E Proms 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