I rode the Ocean last month and there was an electrical issue with the train. We all had to get off in Drummondville and be bussed to Montreal. We were stuck on the train for 2 hours while they figured out how to navigate 2 Corridor trains around our long train blocking the town on the single track line. Eventually, they let everyone off and put the Ottawa bound passengers on the Corridor train behind us (now running 90 minutes late) and bussed the rest of us to Montreal.
I was continuing to Toronto, and booked the 1 pm departure instead of the 11 am. I made my train with about 15 minutes to spare. Funny enough, before we left the Ottawa train that the Ocean held up arrived and we passed our empty Ocean consist pulling into Montreal as were leaving.