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GO Rail Expansion - Highway 401 Rail Tunnel

Greater Toronto Area
Project Type:
DBF - Design Build Finance
Infrastructure Type:
Contract Value:
$116.9 million
Estimated Value for Money:
$23.1 million

About the Project

GO Rail Expansion will transform the transportation network in the Greater Toronto and Hamilton Area over the next decade. Metrolinx will transform the GO Transit rail network into a system that will deliver two-way, all-day service every 15 minutes over core segments of the GO Rail network. The Highway 401 Rail Tunnel project involved the construction of two rail tunnels under Highway 401 and Highway 409, passing beneath 21 lanes of traffic. The project reached substantial completion on July 21, 2021. The tunnels will support future increased capacity on the GO Kitchener rail corridor.


  • Request for Qualifications
    Sep 14, 2016
  • Short-list Bidders Selected
    Feb 16, 2017
  • Request for Proposals
    Feb 16, 2017
  • Winning Bidder Selected
    Dec 14, 2017
  • Construction Begins
    Mar 15, 2019
  • Construction Ends
    Jul 21, 2021

Latest News

Winning Bidder

Toronto Tunnel Partners: (Applicant Lead) EllisDon Capital Inc. and STRABAG Inc.; (Construction) EllisDon Civil Ltd. and STRABAG Inc.; (Design) WSP Canada Inc., Dr. Sauer & Partners, and Amec Foster Wheeler; (Financial Advisor) EllisDon Capital Inc. and STRABAG Inc. 


To help increase capacity on the Kitchener Corridor, which passes under Highway 401/409 through a tunnel, infrastructure upgrades are required:

  • Construction of two tunnels under Highway 401/409 to accommodate two additional tracks, future signaling and communications infrastructure
  • Replacing footings of retaining walls that support the ramp from eastbound Highway 409 to eastbound Highway 401

Community And Green Benefits

  • Reduced traffic congestion, greenhouse gases and fuel consumption
  • Improved quality of life for commuters by reducing daily travel time 

Economic Benefits

Design and construction of the project will generate employment opportunities, produce significant benefits for commuters.

Terms of Use

These project documents are being made available on this website for informational purposes only. Neither Infrastructure Ontario nor Metrolinx makes any representation or warranty regarding the accuracy or completeness of the content or form of these documents.

Infrastructure Ontario and Metrolinx, in their sole and absolute discretion, may choose to make available on this website amendments, revisions, modifications or replacements to these documents. These documents remain open for further revision, modification, replacement or cancellation by Infrastructure Ontario and Metrolinx at any time and in no event shall either Infrastructure Ontario or Metrolinx be responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use of or reliance on the content of these documents.