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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