Signalling of the Toronto subway

The Toronto subway uses a variety of signalling systems on its lines, consisting of a combination of fixed block signalling and moving block signalling technologies.

The oldest signalling system is known as automatic block signalling and was designed for the system's heavy rail lines: Line 1 Yonge–University, Line 2 Bloor–Danforth and Line 4 Sheppard. Since 2022, Line 1 had been fully converted to automatic train control (ATC). Both of Toronto's newer lines, Line 5 Eglinton and Line 6 Finch West, use a modern form of ATC called Communications-based train control (CBTC).

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