Montreal as well. Apparently another benefit is quicker acceleration and deceleration, meaning you can have greater density of stations without heavily impacting transit times.

A big downside for Montreal though is cold weather operation. Steel wheels aren't affected as much by ice and snow, meaning that regular trains can operate on the surface or in a tunnel, whichever makes the most sense for the geography. Rubber tired cars need above freezing temperatures or they'll have traction problems. This has forced Montreal to keep its metro system below ground even in areas where at grade would have made more sense.