A train protection system is a railway technical installation to ensure safe operation in the event of human error. == Development == === Train stops === The earliest systems were train stops, as still used by the New York City Subway, the Toronto subway, the London Underground, the Moscow Subway (only on the older lines) and the Berlin S-Bahn.
A train protection system is a railway technical installation to ensure safe operation in the event of human error. == Development == === Train stops === The earliest systems were train stops, as still used by the New York City Subway, the Toronto subway, the London Underground, the Moscow Subway (only on the older lines) and the Berlin S-Bahn.
Source: Wikipedia "Train protection system" · CC BY-SA 4.0
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