Line 4 (), also known as the Airport Link (), is a diesel light rail line on the

O-Train The O-Train is a light rail system in Ottawa, Ontario, Canada, operated by OC Transpo. The O-Train system consists of three lines, all of which are fully Grade separation, grade-separated. As of March 2025, one line is currently being extended an ...

network in

Ottawa Ottawa is the capital city of Canada. It is located in the southern Ontario, southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Gatineau, Quebec, and forms the cor ...

, Ontario. The line provides a connection between Line 2 (also known as the Trillium Line) at South Keys station to Ottawa Macdonald–Cartier International Airport. The line opened on January 6, 2025.

History

Initial plans for expansions of the Trillium Line in 2013 considered an expansion to Ottawa Macdonald–Cartier International Airport. However, these plans were discarded due to lack of funding and a focus on attracting ridership from the south of Ottawa. In 2016, the Ontario provincial government committed $1 billion to O-Train expansion, providing half the required funding for an extension to the airport, with an additional station at the EY Centre. Additional funding was acquired for the Airport Link through federal funding and the airport authority, who constructed the airport station for approximately $20 million, with $6.4 million from the federal government. Construction of the line began in 2019. The line was initially considered to be part of the Trillium Line but was given its own number and colour in November 2020. Construction of Airport station was completed in 2023. On January 6, 2025, Line 4 opened, the same day as Line 2's reopening. Line 4 began with a 5-day service week, expanding to a 6-day service week on January 25, and finally reached a 7-day service week on March 16.

Stations

There are three stations on Line 4, with a connection to the Line 2 at South Keys station.

Rolling stock

Alstom Coradia LINT 41 train at South Keys Station 6461

The line uses Alstom Coradia LINT 41 diesel multiple units. Line 4 has platforms, which are shorter than the platforms on Line 2. The difference in length is due to the use of single-car trains instead of two-car vehicles, because of the line's lower projected ridership. The land and station construction at Uplands and Airport station have been reserved and protected for a potential future extension of the platforms, to accommodate 80-metre trains.Trillium Line Extension, Project Agreement – Schedule 15-2, Part 4 - Stations
''City of Ottawa.'' 2019. Retrieved April 13, 2025

References

External links

{{OC Transpo

O-Train Rapid transit lines in Canada 2025 establishments in Ontario