Welcome aboard Lines 2 & 4
Seven-day
service starts March 16
Lines 2 & 4 extend the O-Train south, linking Bayview to Limebank and Airport stations.
The lines connect Little Italy to Riverside South, with frequent departures to Carleton University and the Ottawa International Airport.
Get ready
For the Lines 
and 
Seven days/week
Since the launch of weekday service on January 6 and the six-day service on January 25, O-Train Lines 2 & 4 have demonstrated safe and consistent performance.
We are now ready to expand service to the full week (Monday to Sunday) starting March 16.
B2, the parallel bus for Line 2, will continue running until March 29 to allow customers to gradually transition to the new train lines while still having the options to take the bus.
Lines 2 4
Phased opening
Lessons learned and insights from the Public Inquiry report have shaped the phased opening of Lines 2and 4. Organized into three phases, this approach helps customers get familiar with the service while supporting staff training.
The second phase, a six-days-a-week service, has been in place since January 25.
Starting March 16, service expands to a full seven days schedule, including Sundays.
Phase 1
5-day service
Launched - Jan 6
Phase 2
6-day service
Launched - Jan 25
Phase 3
7-day service
Starting March 16
Why a phased opening?
A phased opening allows staff to monitor the system closely, identify potential issues, and address them before expanding the service. This approach ensures system safety and reliability. It also ensures an optimal customer experience.
Travel Planner now available
Lines 2& 4's weekday + staturday service launched on January 25. The next and last phase, full week service (Monday to Sunday), begins on March 16.
Get ahead with our Travel Planner—explore the service, check schedules for Weekdays, Saturdays, and Sundays, and start planning your journeys today!
Bus service
for full seven-day O-Train South service
Drawing from experience, we’ve designed a plan to support you and ease your transition to the O-Train.
- What to expect?
- 1.
Parallel bus service will continue to run alongside the Lines 2 & 4, after seven-day service begins. - 2.
B2 runs until March 29; Routes 97 and 99 until April 27 and the New Ways to Bus launch. - 3.
This service was designed to provide transportation options as you get accustomed to the new train system.
- Here’s how bus service in the south will connect with Lines 2 and 4 when the seven-day service begins :
-
Line 2 buss will become B2
The B2formerly the Line 2 bus, will continue running between Bayview and South Keys stations until March 29.
-
74, 198, 278,and 406
Routes 74, 278, 198, 406will continue to provide connections to Limebank Station. -
Route 97
Route 97 will continue to run every 15 minutes, serving South Keys, the Airport, and running alongside Line 4 between South Keys and the Airport. The service will continue until April 27. -
Route 99
Route 99 will make a new connection at Limebank Station, with buses running every 30 minutes. The service will continue until April 27.
Parallel bus service map after the launch of the 7 days service of Lines 2 & 4
Click on the map to open the PDF
O-Train service disruptions
If there’s a disruption to O-Train service on Lines 2 or 4 during the transition period, nearby alternate bus service will already be running.
This was an important lesson learned from the launch of O-Train Line 1.
During disruptions:
- Our control centre will actively monitor these routes and add additional buses when possible to meet demand.
- Audio and visual messages, along with station signage, will help guide you during your journey.
- If there are delays, stay updated by following OC Transpo on social media or checking our website homepage for service updates.
Bus network changes coming April 2025
The New Ways to Bus network will come into effect in April 27, opening up new convenient connections across the city.
What you need to know :