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In 1960, GRS opened the "General Railway Signal Company de Argentina" (GRSA) division in Buenos Aires, which provided manufacture, installation and technical support of GRS railroad signalling systems in Argentina. Some local railroad lines that were provided with GRSA products were Belgrano Norte, Belgrano Sur, Urquiza and Sarmiento. Most of ...
The system is designed so that the control centre cannot issue a new token for a section of line until the current one is 'returned'. Trains cannot send tokens to each other. This system allows the whole line to operate without any additional signalling personnel, and has functioned without major incident.
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An electro-mechanical treadle. In railway signalling, a treadle is a mechanical or electrical device that detects that a train wheel has passed a particular location. They are used where a track circuit requires reinforcing with additional information about a train's location, such as around an automatic level crossing, or in an annunciator circuit, which sounds a warning that a train has ...