Abbreviations For RLY Technical Terms

Traffic, Safety & Signaling

ABS	Automatic Block Signaling
ACD	Anti-Collision Device
AE	Automatic Emergency (type of brake system in Loco)
AFTC	Audio Frequency Track Circuiting
ATC	Automated Train Control
ATP	Automatic Train Protection
ATS	Automatic Train Stop
ATV	Automatic Vacuum Brake
BPC	Brake Power Certificate
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
DAC	Digital Axle Counter
FM	Fouling Mark
MACLS	Multiple Aspect Colour Light signalling
NI	Non-Interlocked
NX	eNtrance-eXit (interlocking panels)
PI	Panel Interlocking
OFC	Optical Fibre Cable
RPC	Resistance Power Control
SPAD	Signal Passed At Danger
SSDAC	Solid State Digital Axle Counter
SSI	Solid State Interlocking
STRI	Stencil type Route Indicator
SW	Single wire (Semaphore signals)
SWR	1. Station Working Rules 2. Short Welded Rail
TALQ	Two-Aspect Lower Quadrant
TAWD	Train Actuated Warning Device
Tr. Ckt.	Track Circuit
TRT	Traffic Recovery Time

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