Since September 2015 the two TBMs have installed 26,178 concrete tunnel segments forming 4363 rings on the 3.3km eastern section of the tunnel from Brentcliffe Road to Yonge Street. TBMs Dennis and Lea completed tunnelling of the western section when they reached Yonge Street in May.

The 19km line is being built by the Crosslinx Transit Solutions consortium under a 30-year $C 9.1bn ($US 7bn) finance-build-maintain contract awarded by Toronto and Hamilton transport authority Metrolinx and Infrastructure Ontario in November 2015.

The 25-station line will run along Eglinton Avenue from Mount Dennis (Weston Road) to Kennedy. Commissioning is scheduled for 2021.