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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. The remaining lines use automatic train control : Line 3 Scarborough uses an early form of ATC known as transmission-based train control , while part of Line 1 as well as Line 5 Eglinton, a light-rail line under construction, uses or will use a modern form of ATC called communications-based train control.
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