Headway. Way of distancing the trains in line, ensuring the safety conditions of the circulation. It consists in the verification that a train that precedes another train on the same track and in the same direction of travel, has abandoned the track section that must be engaged by the next train. The distancing therefore requires a certain distance to be maintained between one train and the next, or Block Section. The section is generally a section of line between two stations, or between successive signals
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