Wouldn't be better to tag it as a track? From a cycling perspective, I can't say that a route like Petit Train du Nord or Canal Lachine is the same as a cycleway near a road (REV). There should be a distinction between 100% cycleways and cycleways on the side of the street. From a cyclist perspective, it's nice to see where I can go on a ride on a road without cars. That's my 2 cents.

Here's how cycletrack is defined : A cycle track is separated from the road by curbs, parking lots, grass verges, trees, bollards or another physical barrier, but is running parallel and next to the road. In North America this is called a protected bike lane, separated bike lane, greenway, green lane, or class IV facility

https://wiki.openstreetmap.org/wiki/Key:cycleway#Common_values