"centralized traffic control" . . "CTC signalling system" . "interconnected, central-dispatched" . "Centralised Traffic Control (CTC)" . "central control office" . "CTC signalling" . . "railway traffic control" . "tower" . "centralized dispatchers" . . "(CTC)" . "central control" . "CTC control panel" . "Traffic Control System" . . "CTC" . . "fully automatic computer-planned and executed train meet" . "Computerized Traffic Control" . "CTC Machine" . "centralised traffic control panel" . "railway control centre" . "Centralized traffic control" . . "centralised traffic control centre" . . "operation in either direction on both track" . "power signalling" . "Railway centralized traffic control" . "Centralised Traffic Control" . "centralised traffic control" . . "operate against the current of traffic" . "Centralised control" . "Train control systems" . "remotely controlled" . . "traffic control centre" . "Central Traffic Control" . "CTC system" . "Centralized traffic control" . "Centralised Train Control" . "National traffic control system" .