A train control system that communicates track occupancy and speed limits directly to the locomotive's interior displays. It uses coded track circuits to send continuous data through the rails to pickup coils on the locomotive. This allows trains to operate safely at higher speeds or in poor visibility where wayside signals might be missed.
Heard on the job
The new subdivision is entirely set up for cab signalling, so we're removing the old wayside masts.
Related terms
Cab signal
A display inside the locomotive cab that shows the condition of the track ahead.
Track circuit
A low-voltage electrical circuit running through the rails to detect the presence of a train.
PTC
Positive train control: an onboard and wayside system that stops a train before it breaks a speed limit or authority.