Graphic timetable, once completed by hand by the Central Traffic Manager, today using a computerized tool. It is the graphic representation of aids to the Central Traffic Manager, which depicts the real running of the trains, according to the conventions of the theoretical graph. This registration is used to identify gear interference, and to support the operator in defining priorities and intersections, and to adjust other incompatibilities (interruptions, etc.). The drawing of the hourly chart follows certain conventions (eg color of the traces according to the train type) and allows other annotations. In modern computerized command and control systems, the real graph can be created automatically using Train Graph (TG) in real time
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