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Network-Wide Structures Project

Network-Wide Structures Project - Proposed Infrastructure and Studies

To support the GO Expansion Program, the Network Wide Structures Project is proposing one grade separation along the Barrie rail line.

Purpose and benefits of grade separations

A grade separation is separating the road from the rails, so that vehicles and or pedestrians can pass under or over a railway, without having to stop and wait for the trains.
Grade separations are essential to support transit expansion, and provide other community benefits, including:

  • Improved traffic flow and elimination of the potential for conflicts between trains and vehicles

  • Better connections and crossings for pedestrians and cyclists

  • Air quality benefits from reduced car idling

  • Reduced noise from at-grade crossing signals and train whistles

  • Opportunities to bring roads up to new standards, by incorporating wider lanes and sidewalks, separated bike lanes, or improving lighting

Metrolinx is improving service as part of the GO Expansion Program by increasing train frequency and availability.

The long-term goal and vision of the GO Expansion Program is to provide 15-minute two-way all-day service.

With trains planned to run every 15 minutes (a crossing every 7 minutes in one direction or the other), it is not possible to maintain certain at-grade crossings.

By grade separating the crossings, Metrolinx can increase travel speed and capacity on our rail lines by allowing trains to freely pass over or under roads without the need for stoppages. Grade separations will support the growth of our cities by increasing traffic flow and transit capacity.

Proposed grade separation

The EPR addendum includes the following proposed grade separation. Click the following links to learn more about the proposed grade separations and an overview of associated potential impacts and proposed mitigation measures. Design has been updated since Round 1 of public consultation.

City of Vaughan, York Region

Please note that the proposed infrastructure is based on reference design concepts that may be subject to change during the detailed design process


Environmental studies are important components of a TPAP Addendum. Along with public feedback, they inform the Draft Environmental Project Report (EPR) Addendum that becomes subject for public review and the Minister’s approval.

These studies look at existing conditions to assess potential impacts from construction and operation of the proposed infrastructure and future train service, recommend mitigation measures/monitoring commitments, and provide key information for concept designs.

To read the EPR Addendum and associated technical studies, visit the EPR Addendum page

An Operational Noise and Vibration study was undertaken as part of the GO Rail Network Electrification Addendum . This study can be read as part of the Network Wide Structures Project EPR Addendum appendices.

Metrolinx has undertaken a regional air quality study to assess the operational impacts of the GO Expansion services. The operational air quality effects of electrified GO Trains along the Barrie Rail Corridor have been assessed at the regional scale as the future service will be (mostly) electrified, and as a result the corridor will experience reduced local air contaminant concentrations from operations. This study can be read as part of the Network Wide Structures Project EPR Addendum appendices.

Following the TPAP Addendum phase, the proposed infrastructure will move into detailed design and implementation phases. During these phases, all applicable regulations, permits, approvals and best practices will be adhered to. A few of the key preliminary commitments include:

  • A range of municipal permits and approvals may be required for the Project, particularly as pertaining to municipally owned lands and infrastructure. Metrolinx will obtain all required permits and approvals. However, Metrolinx as a Crown Agency of the Province of Ontario is exempt from certain municipal processes and requirements.
  • In these instances, Metrolinx will continue to engage with the municipalities to incorporate municipal requirements as a best practice, where practical, and may obtain associated permits and approvals. 
  • Metrolinx will continue to communicate and engage with impacted municipalities, utilities and services, and property owners throughout detailed design and prior to construction, where necessary.
  • An Environmental Management System (EMS) will be developed and adhered to during construction.
  • Surrounding property owners and tenant will be informed of anticipated upcoming construction.