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Ontario Line FAQs

We know you have questions about the Ontario Line, and we have answers. Below, you will find answers to the most asked-about topics for this important project.

If you have a question that isn't answered below, please reach out to us at so that a member of our team can help you.


Budget and Timeline

Engagement Process

Property Acquisitions

Environment and Community Impacts


Route and Stations

Maintenance and Storage Facility

Budget and Timeline

What is the project budget and who is responsible for funding?

The capital costs of the Ontario Line are estimated at $10.9 billion, and the project is expected to generate $9.9 to $11.3 billion in economic benefits for the City of Toronto and the Greater Toronto Area as a whole, with an expected benefit cost ratio (BCR) of 1.05 – meaning for every dollar spent in the region could result in a benefit of $1.05.

In April 2019, the provincial government announced a $28.5-billion subway expansion program, of which $11.2 billion has been committed by the province. On May 11th, the federal government announced a 40 per cent funding commitment to Ontario’s four priority subway projects, including the Ontario Line.

The projects are being procured and delivered by Infrastructure Ontario and Metrolinx.

When will construction begin?

Construction started in December 2021 when teams broke ground on Exhibition Station early works. This work includes rail corridor expansion and other modifications at Exhibition Station, and utility relocations. The overall schedule and completion dates will be determined through the procurement process for the project.

Engagement Process

How is my feedback considered?

One of the main reasons we seek feedback is to uncover insights we might not have anticipated. We are continuously looking at how we might be able to modify parts of our plan based on what we hear from communities – whether we get that feedback through formal public meetings or one-on-one conversations.

What say will the community have on station design, station names?

Stations will be designed with the community in mind, using a set of guidelines that will make sure they are attractive and fit into the areas they will serve.

We’ll be looking for opportunities throughout the planning and design process to get public feedback on design elements. We look forward to working with community members and the City of Toronto on how to design Ontario Line stations that communities will be proud of.

We will work with the communities along the line to determine station names that are clear and representative of the neighbourhoods they will serve. We’ll share more details on those opportunities in the future.

Property Acquisitions

There are several older, historic buildings along the route, like the ones at King-Bathurst and Queen-Spadina. How will your work affect them?

We always strive to reduce or avoid impacts to these kinds of properties because we know how important they are to the fabric of the city, and we know we need to do everything we can to preserve the historic character of our neighbourhoods. Making room for new transit infrastructure in a dense, urban environment does mean that some existing buildings will be impacted, but it’s our job to keep those impacts to a minimum.

If we can’t avoid certain impacts, we work with heritage specialists to see how we can reuse or incorporate heritage features, including exterior facades of buildings, and how we can commemorate their significance with permanent plaques or signs.

We completed a comprehensive inventory of heritage properties and cultural heritage landscapes, including Heritage Conservation Districts for the Environmental Conditions Report, which you can view here.

How many properties will you be acquiring? How will I know if my property is impacted?

We will be acquiring 906 properties to support the construction of the Ontario Line. Some properties will only be needed temporarily, while others will be needed permanently. In some areas, we will only need slivers of properties, while in others we will need full properties.

We have reached out to owners for every property, and their tenants where possible, to gauge their needs and determine next steps. We appreciate how hard this can be, and we are committed to taking care of each affected individual to ensure they do not experience a loss as we deliver this long overdue transit improvement.

Learn more about the property acquisition process.

Environment and Community Impacts

How will you address noise and vibration from the Ontario Line during construction and operations?

We will do everything we can to work with our contractors to ensure communities stay peaceful and quiet both during construction and operations.   

During construction, we’ll continuously monitor noise levels and use tools like equipment silencers and temporary noise barriers to keep things as quiet as possible.  We will ensure noisy activities occur during daytime whenever possible and plan truck routes that will minimize on-site movement and avoid travel on residential streets Communities will be notified well in advance of any upcoming construction work, with particular attention on activities that might need to happen outside of regular hours.    

Once in operation, Ontario Line trains will be electric, meaning not only will they be clean and fast, but quiet too. We’ll also use noise walls and other sound-reducing tools in certain areas to keep future operations quiet and unobtrusive and to ensure the Ontario Line doesn’t result in noise and vibration levels that are significantly different than they are today.  In fact, noise levels in some areas of the route will be quieter than they are today, including the joint corridor through Leslieville and Riverside where both GO and Ontario Line trains will run.

How will sound barriers and noise walls be designed with the community in mind?

We are committed to working with the community on the look, feel and features of the new walls to ensure that they fit into the neighbourhoods where they’re being built. The goal is to create welcoming spaces around them that reflect the community’s interests and priorities.

Consultation with the community started September 23, 2021 with the launch of an online survey to collect feedback on wall features.

How will noise walls be designed with the community in mind?

We are working with the community on the look, feel and features of the new walls to ensure that they fit into the neighbourhoods where they’re being built. The goal is to create welcoming spaces around them that reflect the community’s interests and priorities. Learn more about our progress.

How many trees will be removed to build the Ontario Line?

We are still surveying trees along the Ontario Line route. These surveys detail the nature and health of all the trees and will be completed on staggered timelines for each construction project across the route. Some of these tree surveys will not be completed until a constructor is on board for the larger construction packages.

In a built-up and growing region, some trees need to be removed to make room for new transit lines. To offset these removals, Metrolinx follows a detailed, science-based plan for planting new trees and keeping the region green. Overall, our practice is to plant more trees than we remove as we build new transit. Our goal is always to keep the number of trees we remove to a minimum and we strive to replace them in areas where they are being removed as early as we can.

Read more about our Vegetation Management and Tree Compensation Program.

Is Metrolinx doing environmental assessments for this project? How can we be sure the health of our communities and our green spaces are being respected?

Metrolinx has completed several environmental assessments for the Ontario Line including five early works reports for specific locations along the Ontario Line route where initial construction will start. The Environmental Impact Assessment Report (EIAR) was the last phase of the environmental assessment for the Ontario Line, representing a major milestone for the project, and was published on April 8, 2022.

The report looks at the entire Ontario Line project footprint from Exhibition all the way to the Science Centre and outlines existing environmental conditions, potential project impacts and ways to minimize or avoid them across a number of topics, including traffic, noise and vibration, and trees and vegetation, to name a few. 

You can view all past environmental assessments on

How will community impacts be dealt with?

An important part of the planning and design work for a major project like this involves hearing from communities about the plans. Metrolinx has held numerous in-person and online open houses across the alignment this year to gather feedback. Drawing from this, Metrolinx has made refinements to the alignment in places like Leslieville. With the station situated mostly to the south of Queen Street and spanning over the existing rail bridge, the popular Jimmie Simpson Community Centre will be able to continue operating throughout construction and beyond.

Also, Metrolinx will add effective, well-designed sound barriers, landscaping, and new trees and greenery to significantly reduce the sound and visibility of the rail corridor in Riverside and Leslieville, and the trains that will operate within it, including GO and VIA trains.

In Thorncliffe Park, plans were updated to move much of the line off Overlea Boulevard. Instead of the original plan to proceed along Overlea after reaching the neighbourhood station, the Ontario Line will instead turn to the north to run next to the nearby hydro corridor, reducing community impacts and creating a better fit for the neighbourhood.

Metrolinx will continue to work with communities to ensure a comprehensive array of measures are in place to address any noise or vibration impacts and to ensure designs are sensitive and respectful of communities.

Community consultation will be launched this spring to seek feedback on noise wall design and landscaping.

What are you doing to protect park spaces?

Providing ongoing access to beloved community park space will be a top priority for us as we deliver this important project.

We know that spaces where we can relax and unwind and children can play are vital in communities, and we are committed to working with our community partners to ensure there is continued access to park and playground space as we deliver better, faster and easier transit.

We are still finalizing property needs, striving to minimize the footprint of our work wherever possible. If we do need to temporarily occupy some park space to support construction and avoid impacts to nearby homes and businesses, we will work with the city to ensure that it is thoughtfully restored once the project is finished.

While there may be some impacts to parks during construction so that we can avoid having to acquire private property, we are committed to only using the space that is absolutely necessary.

Won’t running the Ontario Line above ground through Riverside and Leslieville negatively affect the quality of life in the community?

Finally bringing a rapid transit station to rail corridor in Riverside and Leslieville will provide much-needed relief to the 501 streetcar and make it better, faster and easier for people who live and work in this vibrant area to move around the city and the region.

We also expect to improve background air quality levels by allowing people to leave their cars at home and take transit instead.

Operating electric-powered trains will ensure that no additional emissions are introduced to the local community due to the Ontario Line. The planned electrification of numerous GO trains that run through the rail corridor in the Leslieville and Riverside area will also have a similarly positive impact. Lower levels of noise and vibration can also be expected from quieter electric-powered trains compared to the diesel-powered GO trains that are operating in the corridor today.

Noise levels in the community will be lower than they currently are in most areas of the Leslieville and Riverside communities thanks to the continuous noise walls we will be installing in this area. We will also be pursuing a wide array of other proven solutions for reducing noise and vibration at the source such as continuously welded rail, ballast mats, rail isolation systems and more. Metrolinx is working closely with the Ministry of the Environment, Conservation and Parks to ensure we meet or exceed all applicable guidelines and regulations.

What options do businesses have if their buildings are needed for construction?

Metrolinx’s top priority is to work with owners and tenants to help them relocate and continue operating within the community or nearby. If operations are impacted, Metrolinx provides compensation and supports to make up for that. The terms of commercial leases are always taken into consideration.We understand that moving can be a challenge at the best of times, and may be particularly difficult given the pandemic. That’s why we’re doing everything we can to make sure this process goes as smoothly as possible for everyone. We will work closely with each business or organization to ensure their continued operation and success.

When businesses and community organizations need support transitioning, our dedicated team of professionals work one-on-one with them to come up with solutions. Everyone’s needs are different, so each case is considered independently, and we challenge ourselves to come up with creative solutions that are tailored to each one.

Learn more about the property acquisition process.

Will there be supports for businesses impacted by construction, but able to stay open?

We’re committed to ensuring local businesses remain accessible and successful throughout this important project.

We’ll work with the business community to provide customized, tailored supports, from making sure store fronts are clear and easy to access, to working together on promotions and shop-local incentives, to helping them relocate to other nearby locations if their properties are needed to support construction.

We are also opening community offices along the route, with community engagement staff available during business hours to answer questions, provide updates and help support local businesses and organizations through construction.

During construction, we will have a 24-hour hotline that will give the community direct access to someone who will listen to their concerns and help address any issues.

This will be an ongoing process, and we are committed to keeping an open, two-way dialogue going so we can continuously strengthen and improve our supports for local businesses.

Will there be lane or street closures because of construction? How will you manage traffic impacts across the city if there are any closures or diversions?

Yes, there will be some temporary and longer-term lane and street closures. Building a subway through such a densely populated urban area is a challenge, but we’re committed to keeping people moving during construction. Our top priority is maintaining safe access for all.

We’ll be working with communities, local BIAs, elected officials and the TTC on plans to maintain safe access to local stores and businesses with robust safety measures and frequent communication. These plans will involve:

  • avoiding or minimizing impacts to existing transit services as much as possible;
  • communicating early and often about any temporary impacts to roadways and transit lines;
  • looking at other projects that may be taking place to see how they might affect our plans;
  • ensuring communications about any changes are clear and highly visible across many different channels.

View the interactive map of the Ontario Line, which is updated with traffic plans as they become available.

Browse community notices to see what construction is underway, and what to expect while work is carried out.

What will happen to Pape Avenue Junior Public School, which the line seems to run under?

The Ontario Line will be underground by the time it reaches Pape Avenue Public School, so the property won't be impacted.

We're working closely with the school and parent council on plans to keep the surrounding area safe for students and faculty during construction while also protecting the building and playground.

Will any sidewalks or roads need to be temporarily or permanently removed to make way for the above-ground section in the north segment?

Building an elevated guideway in this area will help us minimize impacts to sidewalks or roads by avoiding large excavation sites that would otherwise be needed for tunneling. We also don’t expect to permanently impact any roads in this area.

While there may be impacts to some roads and sidewalks during construction, we’re going to strive to keep them to a minimum. We’ll put safety precautions in place and communicate about impacts early to keep the community informed and safe as they travel through the area.

Will the elevated tracks in the northern part of the route prevent bike lanes from being put on the Don Mills Road/Overlea Boulevard bridge to connect to existing bike paths?

Current plans have the guideway off the roadway on both Overlea and Don Mills, but plans for the public area under the guideway could include a multi-use path. We will work with the City of Toronto and seek public input on how to best use this space to serve the community, and we’ll share updates on these opportunities throughout the course of the project.

Current Ontario Line plans avoid crossing the Overlea Bridge to minimize impacts to Valley Park Middle School and the community cricket pitch.

What will the hours of construction be?

We’ll make sure that construction disruptions are minimal, with most work happening on weekdays and weekends between 7 a.m. to 7 p.m. However, some work will need to be done overnight, like tunnel boring. We’ll communicate early and often with communities as soon as we know about any planned overnight construction work.


What vehicle/train will be used for the Ontario Line?

The Ontario Line is expected to feature modern, automated, electric trains like the ones used in Vancouver, London, Paris and Singapore. This technology could allow for a higher frequency of service (up to 40 trains per hour) with as little as 90 seconds in between trains.

Will the Ontario Line have platform edge doors to prevent people and objects from finding their way onto the tracks?

Yes, all Ontario Line stations will have platform edge doors that will open and close in sync with vehicle doors.

Route and Stations

Why can’t the whole line be underground?

Decisions around the route and the elevation of the Ontario Line have been made with the whole network in mind, but they’re also tailored to the specific communities the line will serve. That’s why it will run in tunnels, along existing railways, and on elevated structures where it makes sense to do.

When determining the Ontario Line’s route and elevation, planners balanced considerations like:

  • how many people could be served,
  • how much travel time could be saved
  • how many connections could be made to other major rapid transit lines
  • how quickly and effectively the line could be built
  • how effectively any local impacts could be managed, and
  • how to ensure the best possible use of taxpayer dollars.

In the newer, northern part of the city where there are wide roadways and streets, the Ontario Line will run on modern, elevated structures because there’s room for them, and construction will be faster and less impactful. In places where there are existing rail corridors, like Leslieville, Riverside and near Exhibition place, the line will fit into an existing rail corridor, giving surrounding communities the benefits of faster and less impactful construction by avoiding complex and time-consuming tunneling and building in land we already own. These above-ground sections have the added benefit providing faster and easier connections to and from surface transit, because the stations aren’t deep underground.

In other dense parts of the city with narrow roadways and no available rail corridors, tunneling is the only choice.

Like everything, there are pros and cons no matter which option you choose – but we only choose options that we know will work extremely well for the communities they serve. For the sections that run on or above the ground, we know we can significantly cut down on property impacts, introduce effective, well tested noise and vibration solutions, create new and welcoming public spaces, and build best-in-class infrastructure that is safe, attractive and designed with communities in mind. That’s something we are absolutely doing as we continue to engage with communities throughout the planning and design process.

Couldn’t the Ontario Line go underground after East Harbour, before reaching Riverside and Leslieville?

We considered whether it would be possible to bring the Ontario Line underground just east of the proposed surface station at East Harbour, where Ontario Line trains will connect seamlessly with above-ground GO trains. We looked at a number of options and planners have determined an underground alignment in this area would not be practical for a variety of reasons, most of which are related to the disruptions it would cause in the community and the benefits that would be lost with an above-ground alignment.

Firstly, a portal would need to be built between Eastern Avenue and Queen Street to ensure Ontario Line trains remain above ground as planned at East Harbour. Creating a quick and easy interchange here is critical in tackling congestion at Union Station, where crowding could go down by as much as 14 per cent – or 14,000 fewer people – during the busiest hour. Moving the portal would also result in:

  • Extended journey times
    If the Ontario Line were tunneled in this area, stations would need to be nearly 40 metres deep to go under the Don River, maintaining a similar depth up until Gerrard where large sewer mains would need to be avoided. That would be as deep as a nine-storey building is tall, requiring three separate escalators to get to the trains and adding 4.5 minutes to customers’ journeys. This would ultimately discourage people from transferring to and from GO trains at East Harbour and result in less crowding relief at Union Station.
  • Longer – and more – construction
    Building a portal in this area would prolong construction and cause significant and lengthy community disruption from soil excavation, utility relocation, concrete pouring and many other construction activities. For example, one dump truck going in and out every 20 minutes, 24 hours a day for an entire year plus daily deliveries of building materials like concrete and reinforcing steel would go on for years.
  • Additional property impacts
    Moving the portal would require the acquisition of numerous homes along McGee and Saulter Streets and have significant impacts on most of the parks in the area, and other small businesses and community organizations nearby.
  • Permanent street closures, loss of Queen Street station
    Trains need to safely move from above ground to below. The maximum track grade, or steepness, of a track that is diving underground is 4.5 per cent. At this grade, a portal would need to be built in the area of Eastern Avenue and extend as far as Queen Street. Significant excavation to lower the levels of land would be needed to build a portal and retaining walls for the shallow tunnel structure. This would result in a permanent closure of Eastern Avenue or Queen Street, disrupting existing traffic and transit services. Worse, there would not be enough room for a station at Queen and De Grassi.

    To avoid that closure and still build a station, the streets and the existing bridges that run above them would need to be raised by at least two metres. Even then, there would not be sufficient space for a customer concourse in the station at Queen and De Grassi – only platforms.

    Eliminating the station would greatly reduce customer benefits – especially for people living in the immediate vicinity – and the much-needed relief for the 501 streetcar will be lost. The additional costs of this approach will exceed $800 million.

    To avoid raising the road and the rail bridge would require a track incline steeper than what most subway vehicles in the world can manage.

While there are pros and cons to both underground and above-ground approaches, the analysis shows that an above-ground alignment through Riverside and Leslieville will result in far fewer community impacts and deliver significantly more benefits.

Is it safe to run the Ontario Line within the joint rail corridor through Riverside and Leslieville?

Wherever Ontario Line trains will run on a joint rail corridor – as they will through Riverside and Leslieville – they will do so on their own dedicated tracks that will be completely separate from other rail operations. We will use a dedicated, Ontario Line-only signalling system that will use the latest signalling and monitoring technology. This system will ensure trains are in constant communication with one another, so their precise location is known at all times, meaning vehicles always stay a safe distance from one another. With sensors that can detect objects on the tracks, trains will also automatically stop if there is something blocking the way.

Train doors will also automatically open and close in sync with platform edge doors that will be installed at all stations, keeping both passengers and objects safely separated from moving vehicles.

Is there going to be a bus terminal built at the Exhibition Stations for GO and TTC to get riders to the line?

We’re working closely with the TTC on how to best meet future transit needs and make sure customers have easy access to both the Ontario Line and TTC services at Exhibition Station.

Exhibition Station will be an important transit hub for customers using the Ontario Line as well as GO Transit and TTC services. GO and Ontario Line customers will use a shared concourse, making for seamless and quick transfers between the two services.

Maintenance and Storage Facility

Why are you choosing to build a maintenance and storage facility on a site where there are many existing jobs?

The maintenance and storage facility is a critical part of any public transit operation. It’s where trains are housed and maintained to keep them clean and safe for our customers each and every day.

An estimated 44 trains will be needed to meet Toronto’s transit needs when the Ontario Line opens, and the fleet will grow by as many as 10 more vehicles to meet future demand.

After an extensive study of nine different sites across the route, we selected the site in Thorncliffe Park site was selected as our studies showed that it was the best option to meet all of the technical needs for the project. Additionally, this location clearly demonstrated the least impact to local jobs and businesses, which the Province deemed a top priority for Metrolinx.

At the same time, we determined that we could, with certainty, relocate impacted businesses, community organizations and jobs within the community or nearby. This was perhaps the most critical requirement for us as we looked for a site for a facility like this in such a built-up urban environment.

We're now working one-on-one with property owners and tenants in the area to make sure they continue to thrive and deliver the services the community relies on each and every day. Ensuring their continued success in the community they currently serve is extremely important to us.

How is Metrolinx working with the Islamic Society of Toronto and Darus Salaam mosque?

In December 2021, we signed an agreement with the Islamic Society of Toronto to invest in a community vision for a new Darus Salaam mosque and community hub in Thorncliffe Park. The new facility will include larger and more extensive prayer spaces, new religious services and facilities, a mezzanine area that will provide bigger and better prayer spaces for women, as well as areas for educational and schooling programs. This new space will also offer a business centre for local, community-based organizations and businesses to relocate to and will offer new gymnasium facilities to play sports such as, basketball, volleyball and indoor cricket – all just steps away from the new Thorncliffe Station.

Community input, engagement and feedback is important to us and we will continue working collaboratively to ensure their vision is realized and to support residents, businesses and organizations as they continue to thrive and grow for years to come. You can read more about this agreement here.