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| Rail transport in Ontario | |
|---|---|
| Name | Rail transport in Ontario |
| Caption | Canadian National freight train in Ontario |
| Locale | Ontario, Canada |
| Began operation | 1836 |
| Operator | Canadian National Railway, Canadian Pacific Kansas City, Metrolinx, VIA Rail, GO Transit, Ontario Northland Railway, Ontario Southland Railway |
| Gauge | Standard gauge |
| Electrification | Partial (GO Transit, Toronto streetcar network) |
Rail transport in Ontario provides a dense network of intercity, commuter, urban and freight services that connect the Greater Toronto Area, northern communities, the Great Lakes ports, and cross-border corridors to the United States. The system evolved from early 19th century trunk lines to a modern mix of public agencies and private operators including legacy carriers and short lines. Railways have shaped Ontario's urbanization, industrial growth, and links to the St. Lawrence Seaway and transcontinental routes.
Ontario's rail history began with the Toronto and York Railway and the Ontario, Simcoe and Huron Railway in the 1830s and 1840s, later joined by the Grand Trunk Railway which connected to the Montreal and Kingston Railway. The late 19th century saw expansion by the Canadian Pacific Railway and the Canadian Northern Railway, creating transcontinental connections and stimulating mining booms in Sudbury and Timmins. The 20th century included nationalization and consolidation leading to the creation of Canadian National Railway in 1919 and subsequent rationalization of routes after the Great Depression. Postwar urban growth prompted commuter services by municipal authorities and the emergence of intercity public operators such as VIA Rail in 1977. Deregulation and branch-line sales in the 1980s and 1990s produced regional carriers like the Ontario Northland Railway and numerous short lines, while recent decades saw major infrastructure investments tied to regional agencies including Metrolinx.
Ontario's infrastructure comprises mainlines operated by Canadian National Railway and Canadian Pacific Kansas City, secondary lines held by short lines such as the Ontario Southland Railway, industrial spurs serving the Hamilton steel complex, and port connections at Port of Toronto and Port of Oshawa. Key nodes include the CN Toronto Yard, MacMillan Yard, and the Dundas freight corridor; junctions at Agincourt and Kitchener support intermodal terminals serving the Trans-Canada Highway and the St. Lawrence Seaway. Electrified segments include portions of the GO Transit network and streetcar trackage operated by Toronto Transit Commission in Toronto. Significant infrastructure features are the Detroit River border crossings, the Soo Line links to the Great Lakes shipping hubs, and heritage structures such as the High Level Bridge (Toronto) and historic stations at Union Station (Toronto) and Hamilton GO Centre.
Intercity passenger services are dominated by VIA Rail routes linking Toronto, Ottawa, Montreal, and Windsor, plus long-distance corridors to Sault Ste. Marie via Ontario Northland Railway services. Regional operators include GO Transit commuter rail on corridors to Kitchener, Barrie, Stouffville, Milton, and the Lakeshore West and Lakeshore East lines serving Oakville and Pickering. Urban light rail and streetcar services are provided by the Toronto Transit Commission, with projects managed by Metrolinx and municipal partners such as City of Toronto and Region of Peel. Private excursion and heritage operators like the Muskoka Heritage Railway and the Ontario Railway Museum preserve historic rolling stock and tourist routes.
Freight rail supports Ontario's manufacturing clusters in Windsor, Hamilton, and the Greater Toronto and Hamilton Area supplying the auto industry and steel plants, linking to grain and bulk commodity flows through the Port of Thunder Bay and Port of Hamilton. Major freight operators Canadian National Railway and Canadian Pacific Kansas City handle intermodal containers, automotive shipments to the Windsor-Detroit crossings, and unit trains serving mines near Sudbury; short-line carriers such as Metrolinx partners and the Ottawa Central Railway provide first-mile/last-mile service. Rail yards, intermodal terminals and transload facilities in Brampton, Mississauga, and Hamilton integrate with highways like Ontario Highway 401 to form multimodal logistics chains.
Commuter rail growth is centered on GO Transit, which operates under the provincial agency Metrolinx and coordinates with municipal agencies including City of Toronto and the Region of York. GO Transit has expanded electrification, new rolling stock, and increased frequencies on core corridors such as the Barrie line and Kitchener line, and integrates with regional rapid transit initiatives like the Eglinton Crosstown and planned Ontario Line. Municipal tram and light rail projects link to heritage networks run by the Toronto Transit Commission and regional projects in Waterloo and Ottawa utilize the Ion rapid transit and O-Train systems respectively.
Rail operations fall under federal regulation by Transport Canada and safety oversight by the Transport Safety Board of Canada, with provincial agencies such as Metrolinx and the Ontario Ministry of Transportation participating in planning and funding. Labour relations involve unions like the Teamsters Canada Rail Conference and the Canadian Auto Workers in historical contexts; regulatory milestones include adherence to the Rail Safety Act and implementation of positive train control and grade-crossing improvements under programs tied to Infrastructure Canada funding. Emergency response and derailment investigations frequently involve coordination with municipal emergency services and agencies such as Ontario Provincial Police.
Planned and proposed projects include GO Transit regional express rail electrification, the Toronto Union Station redevelopment, the proposed High Frequency Rail corridor between Toronto and Ottawa/Montreal, and freight corridor enhancements tied to Port Lands redevelopment. Private and public investments focus on increased intermodal capacity at Hamilton and Toronto ports, battery and hydrogen traction pilot projects with partners such as Bombardier Transportation and Siemens Mobility, and network resilience work addressing extreme weather and climate adaptation in collaboration with agencies like Infrastructure Ontario and Public Services and Procurement Canada.