I'm no expert, but with the additional 67km of rail to Montreal's existing 69km of metro + the 5km blue line extension (total of 141km), this would make the Montreal RT system the longest in the country, no? Maybe even the second longest in NA?
edit: I just checked, it would make it NA's 4th (currently 7th) longest behind NYC, Mexico and Washington (!!). I'm also not sure how much TO is adding, or Vancouver for that matter.
https://en.wikipedia.org/wiki/List_of_North_American_rapid_transit_systems_by_ridership
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