Line 2 Automatic Train Control


The TTC’s Line 2 stretches 26.2 kilometres across the city from Kipling to Kennedy station (31 stations in total). Line 2 opened more than 54 years ago on February 26, 1966. Line 2 has been running at ridership capacity with almost 23,400 peak-hour riders. Ridership is projected to reach 26,500 riders at peak-hour capacity by 2031. The TTC installed the original fixed block signal system on Line 2 in the 1960s. A fixed-block signal system divides the subway line into geographical blocks. Only one train at a time is allowed in each block, while the adjacent blocks provide a buffer zone. While this system remains safe for operations, its reliability is diminishing. The replacement of the current signalling system is necessary to accommodate increased ridership demand and provide reliable customer service and experience.

What we’re doing

The TTC has begun planning to resignal Line 2 with Automatic Train Control (ATC) to improve reliability and capacity on Canada’s second busiest subway line. ATC provides the benefit of real-time central train control with precise train location. With ATC, train speed and separation between trains is controlled automatically.

Resignalling of Line 2 will require the TTC to procure an ATC supplier. Similar to Line 1, Line 2 will also need the new ATC system to be designed, installed, tested and commissioned as part of the Line 2 ATC Signals Upgrade. This project will include integration with the new subway trains that will be introduced on Line 2. It also consists of the design, installation, testing and commissioning of ATC train-borne equipment on the Line 2 trains and subway work car fleet.

The ATC system is very complex, and the installation, testing and commissioning activities can only be performed during non-revenue hours or scheduled subway closures during weekends or early evening work.


Some of the benefits that the ATC upgrades will bring to Line 2 and our riders include:

Increased safety

  • Train speed and distance between trains are controlled automatically rather than being human controlled.
  • Real-time central train control with precise train location data.

Travel Time Improvements

  • Trains are operated automatically to optimize speed and reduce travel.
  • Travel time consistent every run.

Lower Operating Costs

  • Train electricity usage will become much more efficient.

Next Steps

The TTC will be initiating a study to select the starting location of the new ATC system and determine what existing equipment can be incorporated into the ATC system. The TTC will start the procurement process looking for an Owners Engineering consultation firm. The TTC will use the specification to go out to tender and procure the future ATC Line 2 supplier.


TTC Board Reports

TTC’s 2020-2029 Key Capital Investment Priorities (January 27, 2020)

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