Commuters making their way downtown from Deux-Montagnes and Mascouche Monday morning faced delays of indeterminate length due to an emergency intervention.

It began at the Canora station around 6:30 a.m. 

As a result, all trains on the Deux-Montagnes line were cancelled until service gradually resumed around 8:30 a.m. 

There's no word on the exact nature of the incident.