Central Station is at the centre of the Quebec City–Windsor Corridor, the busiest inter-city rail service area in the nation (marketed as the "Corridor"), which extends from Windsor and Sarnia in the west, through Toronto, Ottawa, and Montreal, to Quebec City in the east. Inter-city trains at Central Station are operated by Via Rail and Amtrak, while commuter rail services are operated by Réseau de transport métropolitain (RTM). The station is also slated to become a hub for the Réseau express métropolitain, currently under construction. The station is also connected to the Montreal Metro subway system.