The Mont-Saint-Hilaire and Mascouche lines run on Canadian National trackage and operate out of Central Station, while the Vaudreuil-Hudson, Saint-Jérôme, and Candiac lines run on Canadian Pacific Kansas City (CPKC) trackage and operate out of Lucien L'Allier terminus, beside the historic Windsor Station.

[5] The train lines are part of Greater Montreal's integrated public transit network including bus, regional rail (REM) and Metro, coordinated by the Autorité régionale de transport métropolitain (ARTM).

[7] Later that year, the AMT inaugurated service between Blainville and Jean-Talon (now Parc) train station in Montreal's Park Extension district.

Originally, the service was designed to provide a temporary alternative for motorists from Laval and the North Shore of Montreal, while the Highway 117 Dufresne Bridge was being repaired.

A new agency, the Réseau de transport métropolitain (RTM) was created to be responsible for operating commuter rail and suburban transit services.

[18] The construction of the Réseau express métropolitain (REM) led initially to the closure of the Mount Royal Tunnel in May 2020, causing the Deux-Montagnes lines to terminate at Bois-Franc station, and the Mascouche line was rerouted around the Western end of Montreal in order to reach Central Station from the south.

[20] In May 2023, Exo announced that Lucien-L'Allier terminal would be closed starting April 2024 to rebuild the platforms and add a canopy.

[21] Exo services operate within the Autorité régionale de transport métropolitain (ARTM)'s integrated fare structure for Greater Montreal.

The AMT did not purchase additional bilevels as it sought to standardize its train fleet with the arrival of the multi-level coaches.