May 29, 2025: O-Train Line 1 Annual Maintenance and O-Train East Extension Work

This memo is to inform the Mayor and Members of Council of upcoming service adjustments to O-Train Line 1 in June and July for planned annual maintenance and required O-Train East Extension integration activities.

All rail systems require regular maintenance to support the long-term sustainability and reliability of the system. This year, in addition to working with Rideau Transit Maintenance (RTM), OC Transpo has coordinated with the Stage 2 project and Infrastructure and Water Services Department (IWSD) in order to address multiple priorities in parallel to minimize the number of disruptions to rail service for customers.

In June, various maintenance activities will be undertaken, including:

• Localized rail replacement at specific locations.
• Ongoing upgrades of supporting wires (parafils) of the overhead catenary system, to make them more resilient and durable.
• Adjustments to track electrical grounding near Tunney’s Pasture Station.
• Line 1 train control server upgrades.
• Traction Power Sub Station maintenance work.
• Work to be conducted by IWSD as identified as part Ontario Structure Inspection Manual (OSIM) inspections of St-Laurent tunnel.
• General station maintenance and seasonal cleaning.
• Continued testing and integration of the Stage 2 O-Train East Extension with Line 1

For customers this means that the following service adjustments will occur in June:

Every effort has been made to conduct Stage 2 integration work at the same time as other maintenance activities; however, additional service adjustments are required to complete testing activities. It is also anticipated that additional Stage 2 integration work will occur on the weekend of July 5 and July 26 that will affect Line 1 service. More information on specific service adjustments will be provided closer to these dates. It is also anticipated that there will be additional impacts to Line 1 throughout the summer as the O-Train East Extension testing and commissioning progresses and, in the fall, to conduct rail grinding.

OC Transpo staff will be at key stations to support customers during their trips. Customers are encouraged to use the Travel Planner and Transit app to plan their trips. Customers can also visit octranspo.com for travel planning assistance or call 613-560-5000. Information, reminders, and updates will be communicated to customers through various channels, including public service announcements, customer alerts, social media updates, signage at Line 1 stations, and on octranspo.com.

OC Transpo understands and appreciates the disruption that that these service adjustments will cause. We thank our customers for their ongoing patience as we complete these important works to support more reliable and wider reaching rail service for the future.