The next extension of Ottawa’s light-rail transit system opened in January after a nearly three-year delay.
In the construction, the city expanded Line 2 — the Trillium Line of the O-Train — and added a spur Line 4 to the Ottawa airport.
Line 4 opened to the public on Jan. 6. The train runs between the South Keys station and Macdonald-Cartier International Airport, with a stop at Uplands.
The route is located in Gloucester-Southgate Ward. The new trains can carry up to 600 passengers, with 240 seats and standing room for 360 people.
After a long wait, Ottawa residents and visitorsnow have a service that can take them from the airport to downtown in less than an hour.
To do so, riders can take Line 4 from the airport and switch to a Line 2 train at South Keys all the way to Bayview.
Line 1, or the Confederation Line, also travels through Bayview a short distance from Ottawa’s urban core, giving travelers from the south access to faster public transit through the city.

OC Transpo announced that the 97 bus, which goes from the airport to Hurdman Station, would continue to run for a period of time to allow for a smooth transition, until Line 4 service began seven-day service.
The same service was continued for other buses that run parallel with the O-Train, such as Bus 2, which runs from Bayview to South Keys.
At the time of the Line 4 launch, there was optimism about the long-awaited opening of the airport route, but many transit users also expressed doubts about the service because of previous delays and breakdowns.
In fact, mechanical issues with Line 4 created delays only a week after opening. One train was removed from operation for hours, causing gaps in service between the South Keys and Airport stations.
Other expansions in Ottawa’s light-rail system are expected to take place over the next few years.
Line 1 is scheduled to expand east to Trim Station this year. In 2026, Line 1 should also expand southwest to Algonquin College. Line 3 is set to open in 2027, running from Tunney’s Pasture to Moodie Station in west-end Ottawa.