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Guide /
Not sure what some of the abbreviations mean?
Refer to this index of terminologies commonly used in the Singapore's train network.
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NSEWL: North-South East-West Lines
NSL: North-South Line
NSLe: North-South Line Extension (Marina South Pier)
EWL: East-West Line
CAE: Changi Airport Extension (also known as CGL)
BLE: Boon Lay Extension (Pioneer, Joo Koon)
TWE: Tuas West Extension (Gul Circle - Tuas Link)
NEL: North East Line
NELe: North East Line Extension (Punggol Coast)
CCL: Circle Line
CCLe: Circle Line Extension (Bayfront, Marina Bay)
DTL: Downtown Line
DTL3e: Downtown Line 3 Extension (Xilin, Sungei Bedok)
NB: Northbound (NSL to Jurong East or NEL to Punggol)
SB: Southbound (NSL to Marina South Pier to NEL to HarbourFront)
EB: Eastbound (EWL to Pasir Ris)
WB: Westbound (EWL to Tuas Link)
IT: Inner Track (CCL to HarbourFront - Anti-Clockwise)
OT: Outer Track (CCL to Dhoby Ghaut/Marina Bay - Clockwise)
BB: Bukit Panjang Bound (DTL to Bukit Panjang)
XB: Expo Bound (DTL to Expo/Sungei Bedok)
WB: Woodlands Bound (TEL to Woodlands North)
CB: Changi Bound (TEL to Sungei Bedok)
DCC: Depot Control Centre
MOC: Maintenance Operations Centre
OCC: Operation Control Centre
ROC: Rail Operations Centre
BSD: Bishan Depot
CHD: Changi Depot
UPD: Ulu Pandan Depot
TWD: Tuas Depot
ECID: East Coast Integrated Depot (Future)
SKD: Sengkang Depot
KCD: Kim Chuan Depot
GBD: Gali Batu Depot
TSFB: Tai Seng Facility Building
ECID: East Coast Integrated Depot (Future)
MBTMF: Marina Bay Temporary Maintenance Facility (Defunct)
MDD: Mandai Depot
ECID: East Coast Integrated Depot (Future)
EMU: Electric Multiple Unit
LRV: Light Rail Vehicle
PV: Passenger Vehicle
Ebrake or EMG: Emergency Brake
MSS/TS: Maximum Safe Speed/Target Speed
Eg: 40/39 would mean 40km/h is the maximum speed and the train's target speed will be 39km/h.
CCD: Current Collector Device
ECB: Emergency Communication Button/Emergency Call Button
MLU: Mid-Life Upgrade
TOD: Train Operator Display
GTO: Gate Turn-Off Thyristor
IGBT: Insulated Gate Bipolar Transistor
PMSM: Permanent Magnet Synchronous Motor
SiC Hybrid: Silicon Carbide Hybrid
VVVF: Variable Voltage Variable Frequency
ATAS: Automatic Train-bourne Announcement System
VPIS: Visual Passenger Information System
TTIS: Train Traveller Information System
DRMD: Dynamic Route Map Display
STARiS: SMRT Active Route Map Information System (Includes ATiS, VFD & Route Map)
ATiS: Automatic Train Information System (Main unit for STARiS)
VFD: Vacuum Fluorescent Display (Part of STARiS)
KHI: Kawasaki Heavy Industries C151
SIE: Siemens C651
KNS: Kawasaki-Nippon Sharyo C751B
KSF: Kawasaki-Qingdao Sifang C151A
ECX-100: Bombardier INNOVIA APM 100 (C801)
NCX-100 or NCX-2 (Upgraded): Bombardier INNOVIA APM 100 (C801A)
NCX-1: Alstom Innovia APM 300R (C801B)
Other trains are typically termed by their contract numbers. Learn more ›
Learn more on the SGTrains website ›
CBI: Computer Based Interlocking
CBTC: Communication Based Train Control (also known as Moving Block System)
DTG: Distance To Go
VOBC: Vehicle On Board Controller
WRU: Wayside Radio Unit
ATC: Automatic Train Control
ATO: Automatic Train Operation
ATP: Automatic Train Protection
ATS: Automatic Train Supervision
GoA0 - TOS: On-Sight Train Operation
GoA1 - NTO: Non-automated Train Operation (ATP with driver)
GoA2 - STO: Semi-Automated Train Operation (ATP and ATO with driver)
GoA3 - DTO: Driverless Train Operation
GoA4 - UTO: Unattended Train Operation
Learn more ›
AM: Automated Mode
Train drives automatically
CM: Coded Manual Mode (Legacy term during Westinghouse signalling)
Train captain drives train manually
ATPM or PM (TEL): Automatic Train Protection Manual
Train captain drives train manually
RM: Restricted Manual Mode
Train captain drives train manually at a restricted speed (typically under 18km/h)
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HW: Headwall
TW: Tailwall
WD: Wrong Direction
ASK: Assisted Service Kiosk (Also known as TUK-A)
AVM: Add Value Machine
AFC Gates: Automatic Fare Collection Gates (also known as fare gates)
EPAX: Electronic Private Automatic Exchange
ESP: Emergency Stop Plunger
GTM: General Ticketing Machine
HHPSD: Half-Height Platform Screen Doors (1.5m at elevated stations)
HWU: Headwall Unit
PCB: Platform Communication Booth
PSC: Passenger Service Centre
PSD: Platform Screen Doors
RATiS: Rail Travel Information System
STiS: Station Travel Information System
TUK: Top-Up Kiosk
TUM: Top-up Machine
TWU: Tailwall Unit
CSO: Customer Service Officer
SM: Station Master
SA/CSA: Service Ambassadors/Customer Service Ambassadors
TC: Train Captain (Formerly TO: Train Officer)
Technologies used by train operators to improve train service reliabilities.
ATI: Automatic Track Inspection
A system of cameras, lasers & sensors installed underneath trains to detect defects along the track when train is running.
Automated CCD Detection System
Used by SMRT, an artificial intelligence system with a high sensitivity imaging system and a laser-scanner profiles the Current Collector Devices (CCDs) of passing trains.
LVDT: Linear Variable Differential Transformer
The LVDT is a surveillance instrument depot used by SMRT that monitors track conditions and any anomalies on the third rail.
RRV: Road-Rail Vehicle
Specialised engineering vehicles that can be driven on the road or on rail tracks. Used by SMRT to transport material and replace timber sleepers with concrete sleepers.
WILD: Wheel Impact Load Detection
The WILD system used by SMRT relies on fibre optics sensors installed on the rail tracks to automatically detect and identify the locations of wheel defect during train service.
FST: Floating Slab Tracks
P-WAY: Permanent Way
SC: Shorting Switch
SCD: Short Circuit Device
OCS: Overhead Catenary System
X-Over: Cross Over/Track Crossing
These terms are commonly used by trainspotters in Singapore.
AST: Another STARiS Train
ART: Another Refurbished Train
Bar Train: Trains with seats removed and replaced with handle-bars
Camp: Stay in a particular station to spot trains
DNB: Do Not Board
EOLU: End-of-Life Upgrade
MIA: Missing in Action
MLR: Mid-Life Refurbishment
openBVE: A popular train simulator
Refurb: Refurbished
Unrefurb: Unrefurbished (Trains that have yet to undergo refurbishment)
TRN: Train Run Number (Officially termed as Service Number)
X-Coupled/Mis-Coupled: Cross-Coupled (Trains not coupled with its correct pair)
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