It could be an LRC set, or a Venture set that has 32 axles. Those are not subject to the speed restrictions.
You can tell what type of train it is and how long the train is by looking at the seat selection chart. Ventures are identifiable by the area hatched out for the cab in the first or last coach.
Regardless of the train type, Ottawa trains are less affected by the CN speed restrictions than Montreal trains, because a smaller portion of the route is owned by CN.
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That said, CN isn't the only one who creates delays for Via. In terms of real-time dispatching, Metrolinx actually seems to be much worse to Via than CN. See for example the progression of train 59 on the 15th of September:
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Similarly, today Via 59 made it all the way to Eglinton station on time, but Metrolinx decided to route the train behind a GO local train, creating about a 10-minute delay to the Via train instead of just letting the Via train pass by on the express track that was available.
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Here is the on-time performance of Train 59 over the past two weeks according to
https://asm.transitdocs.com/
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