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Centralised Traffic Control (CTC)
A CTC is what is known as a ‘control room’ a central point where a number of signals are controlled. The main facility in the CTC is the control panels that enable operators to monitor and control remotely the movements of trains in the local area or within a CTC area. The panels are like a map on the wall and on the table with sets of points, route map, diagrams and displays.
Diagrams and displays are used to display train information such as the direction it’s headed to operators in a clear and helpful manner. These diagrams are diagrammatic representations of the geographic layout of the physical tracks with illuminated route lights to show which signal the driver is facing.
Train describer
It is a system, which is used to identify trains, assist the CTC operators controlling these trains. It’s main function is to display the number allocated to a particular train on the CTC diagram, thereby showing the operator the location of the train.
This number follows the train as it progresses from station to station on the diagram in predetermined steps. The operator knows at any point in time the location of all the trains under his control.
Interlocking
An interlocking mechanical relays which combines and interlocks the points, signals and track circuits to ensure that no conflicting movements takes place. Interlocking is a control mechanism, which acts as an interface between the operator (CTC), and the equipments. Track circuits (e.g. train detection system). This equipment is used to detect the occupation of a train in a particular line.
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