What is a track circuit?

A track circuit is a electrical device on the tracks that detect trains and inform control rooms that the train is onway.

There for.
Then a Train control operator (TCO)  know exactly that tracks need to change or signals need to set to green for movement.

But
Now If faulty, like the case we having In various areas.

Trains need to stop at red signals.
Driver need to phone local control room

He need to say he's there etc etc.

Example.
Driver stop at red signal.
He phone.

Example.
Control answer.

Driver : Morning TCO of eersterivier, driver of T3220 standing at signal ER13 at danger 🔴 (red)

Control : hello driver of T3220, I TCO Charleston give you driver of 3220 permission to proceed through faulty signal ER13 at danger 🔴
Authority number 331 at 12:00
TCO charleston speaking.

Driver : Thank you TCO

Then driver proceed.

Copy?

Regards.
Charleston