VIA Rail starts allowing bikes on some Ottawa—Québec trains starting today.
It costs $25/bike
https://www.viarail.ca/en/plan/baggages/sports-equipment
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VIA Rail commence à accepter les vélos sur certains trains entre Ottawa et Québec à compter d’aujourd’hui
Il en coûte 25$/vélo
https://www.viarail.ca/fr/planifier/bagages/equipements-sport
via: https://forum.agoramtl.com/t/via-rail-discussion-generale/272/1365?u=edwing
@EdwinG 2 trains in each direction between Québec and Ottawa. No Montréal-Toronto, no Ottawa-Toronto.
Obviously just a trial. Considering that VIA had promised in 2018 to have the Siemens take bikes and that it widthdrew baggage car service in the Corridor based on that promise in 2020, this is too little too late.
"provided that space is available on board."
No text about having to book ahead to reserve that space (as is case for Amtrak). So can be refused boarding.
Edwin G. 
Jean-François Mezei