Construction on The Crosstown line began in summer 2011.
Tunnel Boring Machines: A Recap
The Crosstown tunnel boring machines (TBMs) completed their underground journeys from the east and west in 2016!
Watch the milestones for Dennis, Lea, Don and Humber along the way:
September 2012: The west tunnels contract was awarded.
February 2013: West TBM parts arrive at the west launch site, at Black Creek Drive.
February 2013: The west TBMs are assembled on site. See timelapse photos.
June 2013: The winning names of the TBMs were announced: Dennis and Lea for the west, representing the Mount Dennis and Leaside neighbourhoods; and Don and Humber for the east, representing the rivers. It is a tradition to name TBMs that are constructed for a specific project. Metrolinx ran a naming contest and received more than 500 entries.
September 2013: Metrolinx CEO and Minister of Transportation announce the start of tunnelling! See video.
November 2013: The east tunnels contract was awarded.
Spring 2015: East TBM parts arrive at the east launch site, at Brentcliffe Road. See video.
January 2015: West TBMs break through the extraction shaft at Allen Road. See video.
April 2015: The west TBMs make their big move at surface level across Allen Road so TTC operations are not disrupted. See photo gallery.
January 2015: The west TBMs arrive at their destination at Yonge Street! See video.
August 2016: The east TBMs arrive at their destination at Yonge Street! See video.
The Crosstown is a 19-kilometre corridor that includes a 10-kilometre underground portion, between Keele Street and Laird Drive. The underground potion is tunnelled by two pairs of tunnel boring machines, a.k.a. “TBMs.”
The project is split into three contracts: the west tunnels, the east tunnels, and the stations (including track and everything else) contracts.