The Toronto Subway and RT signals use a system of light-based signals to give instructions to its trains. It uses block signals commonly, as well as interlocking signals. The TTC uses the NX/UR system of signalling, which is also used in New York on the New York City Subway, in Chicago on the 'L', and in Boston on the subway.
Read more about Toronto Subway And RT Signals: Block Signals, Interlocking Signals, Signal Numbers, Temporary Signals, See Also
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—Lawrence Kutner (20th century)