Yes and no. Deux-Montagnes is for all intents and purposes an exclave of Montreal, a suburb that developed a century ago around the CN Two Mountains train station at what is now Grand Moulin. So while other suburbs at stations along the CNoR Two Mountains line also got their starts with the completion of the Mont-Royal tunnel, most — like Town of Mount Royal, Val Royal (Ville St-Laurent), and Roxboro — continued to grow larger, Deux Montagnes grew at a slower pace more akin to a country village, precisely because of its exclaved nature and limited access.
Many cities send tramways or light rail (or light suburban rail) out to far-flung suburbs, but most of them aren’t fully automated on segregated guideways, with completely enclosed stations using platform screen doors. It seems that redeveloping the existing exo6 line to rapid transit standards was a condition in RTM’s cession of the line to the Caisse for their needed route to the airport in the West Island.