O-Train

The O-Train is an urban rail transit system in Ottawa, Ontario, Canada, operated by OC Transpo. The O-Train system consists of three lines, all of which are fully grade-separated. As of May 2026, Line 1 is currently being extended and Line 3 will be constructed as part of the Stage 2 project, with new segments being phased in between 2026 and 2027. The O-Train network currently operates one light rail line, Line 1, and two diesel light rail lines, Line 2 and Line 4. Line 1 travels in a 2.8 km tunnel in the downtown core, and the rest of the network continues to operate grade-separated on surface-level, trenched, or elevated tracks. Line 1 is being extended in both directions, and the eastward extension to Trim station in Orleans was most recently scheduled to open first in Q2 2026, but there is no current timeline for its opening since testing has not yet begun. By 2027, the westward expansion of Line 1 to Algonquin station and the construction of new Line 3 to Moodie station in the west end are expected to be completed. These expansions will bring the system's total length to 64.5 km (40.1 mi), with four lines and 41 stations.