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The Track Flick alert is designed to fire when a track circuit transitions from occupied to unoccupied under a given time. The amount of time provided in the alert should be any value lower than the fastest valid occupation time for the track circuit.

The alert should correctly capture the following conditions;

  • Track circuit flicking during passage of a train
  • Track circuit flicking with no passage of train

Real Example

(AH track circuit transitioned from Dn to Up in 460 milliseconds)

AH TPRUp13:29:25.380Note: Replay confirms there is no occupation of TRs in either direction
Derived Assumption: No train was in section
AH TPRDn13:29:27.420 
AH TPRUp13:29:27.880Note: Replay confirms there is no occupation of TRs in either direction
Derived Assumption: No train was in section

Inputs

Track Circuit TPRThe track circuit input channel to monitor
Minimum Occupation Time (s)The minimum valid occupation time in seconds for the track circuit

Logic

When the TPR transition time from occupied (Dn) to unoccupied (Up) is less than the minimum occupation time, the alert will fire.

 

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