Train 920 on the Deux-Montagnes EXO passenger train line came to a standstill at the Canora station in the Town of Mount Royal Monday morning.
Officials said service was interrupted due to a medical emergency.
A shuttle bus is available to take passengers to Central Station in downtown Montreal.
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EXO says train tickets are valid at both the Sauvé and Côte-Vertu metro stations.
Later trains, including the 921 and 922, to and from Deux-Montagnes were cancelled.
At around 8:30 a.m., the transit authority said ambulances had left the scene and that train service was gradually returning to normal.