DC Track Circuit – Fault Simulation
Simple visual model of a DC track circuit. Toggle train presence and faults to see how the relay and signal respond.
DC
Feed
Feed
Relay
DE-ENERGISED
DE-ENERGISED
Track OCCUPIED / FAULT
UNSAFE
No current at relay: train present or fault condition.
No current at relay: train present or fault condition.
Logic:
• Track clear → current flows → relay ENERGISED → GREEN (safe to proceed).
• Train present or fault (open/short) → relay DE‑ENERGISED → RED (occupied / unsafe).
• Track clear → current flows → relay ENERGISED → GREEN (safe to proceed).
• Train present or fault (open/short) → relay DE‑ENERGISED → RED (occupied / unsafe).