O-Train Line 1 Service to Resume & Root Cause Investigation

The purpose of this memo is to provide an update to Members of Council and the Transit Commission on the resumption of service on O-Train Line 1 and the root cause investigation of the incident on Sunday, August 8.
Rideau Transit Maintenance (RTM) is conducting final preparations and checks of the track in order to resume operation. Trains will complete multiple passes along the alignment this afternoon to confirm everything is in working order and safe. RTM have also confirmed that trains that have undergone the safety certification and inspection process are cleared to go into service.

O-Train Line 1 service will resume on Saturday, August 14, 2021, beginning at 6am, as per the regular start schedule. Service will be operating with a reduced number of trains, running every 10 minutes. As more trains are cleared to return to service, the frequency and capacity of the line will be increased. This reduced frequency will provide enough capacity to carry all customers without overcrowding.

OC Transpo will have buses on standby at strategic locations across the alignment to assist should customer loads be higher than anticipated.

The root cause investigation has identified the fault in the axle bearing assembly. The below picture shows a portion of the interior of the sealed axle bearing unit that attaches the axle/drive shaft to the train wheel. As part of the investigation, the sealed unit was taken apart and it was found that the green section of the bolt, which should be completely tightened, had a very small amount of movement, by fractions of a millimetre. This movement caused damage to the bearings inside the unit and wheel, which in turn lead to the axle coming off the track on Sunday evening.

As the investigation continues, RTM have implemented an inspection procedure that ensures the safe ongoing operation of trains. They will continue to conduct these vehicle inspections until the matter is satisfactorily resolved and safety certified. We have also confirmed with RTM and Alstom that these axle components are in use in other light rail transit vehicles around the world.

The investigation into the cause continues, and further details are expected to be provided at the next Transit Commission meeting. Further service updates will continue to be provided as they become available.

Updates on service continue to be communicated to customers through all channels, including customer alerts, social media updates, signage at Line 1 stations, and Customers can visit for travel planning assistance or call 613-741-4390. Schedules are available by calling 613-560-1000 or texting 560560 plus the bus stop number.

Source : City of Ottawa

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