6. Ground installations
6.1 Track equipment
In addition to the signposts along the line, the track itself is the main medium for transmitting information between the vehicle and the control center.
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Transmission of timely information
The simplest devices include :
an electrical contact between a fixed pad placed between the two rail wires (known in France as a "crocodile") and a brush carried by the vehicle, used to repeat the crossed signal on board;
a pedal located in line with the rail and activated by the passing wheel, giving the train's position for announcing and closing level-crossing gates.
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Ground installations
Traction equipment
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