The Track Circuit Operating Device - Remote Controlled (T-COD (RC) or ZKL) is a Network Rail approved device that creates a circuit in the track that indicates that the section is occupied by simulating a train, which therefore sets the signals to red and the signallers track circuited section to occupied. This enables planned track work in a Line Blockage to have Additional Protection, in addition to signal protection for works to be carried out safely. A requirement is to ensure that the batteries to operate the device(s) are operable and charged. This does require regular maintenance to ensure that the equipment performs as required.

The Track Circuit Operating Device - Remote Controlled (T-COD (RC) or ZKL) is a Network Rail approved device that creates a circuit in the track that indicates that the section is occupied by simulating a train, which therefore sets the signals to red and the signallers track circuited section to occupied. This enables planned track work in a Line Blockage to have Additional Protection, in addition to signal protection for works to be carried out safely. A requirement is to ensure that the batteries to operate the device(s) are operable and charged. This does require regular maintenance to ensure that the equipment performs as required.