Société de transport de Montréal

STM, also known as Société de transport de Montréal, is the public transit agency responsible for operating bus, metro and paratransit services on the Island of Montreal and in certain neighbouring municipalities. It designs routes, schedules and fares, maintains the infrastructure of four metro lines (Green, Orange, Yellow and Blue) and over 200 bus routes, and provides specialized transport for persons with reduced mobility through its adapted transit network. The agency also manages fare collection systems, customer information services and the maintenance depots that keep its fleet operational. As the sole operator of the Montreal Metro, STM holds a unique position in Quebec’s urban transportation landscape, offering rapid transit that moves hundreds of thousands of passengers each weekday and serving as a backbone for the region’s mobility.

Its services are integrated with the regional transit authority, allowing seamless transfers to commuter rail and other suburban networks. STM operates under a mandate set by the Ville de Montréal and is subject to oversight by Quebec’s transportation ministries, which establishes safety, accessibility and environmental standards. The agency employs a large workforce of drivers, mechanics, engineers and administrative staff who are collectively responsible for maintaining service reliability. In October 2020, STM experienced a ransomware attack that encrypted approximately 1,000 servers, including 624 deemed critical, though bus and metro service continued without interruption and no passenger data was compromised. The incident originated from a phishing email and resembled the RansomExx variant, prompting an investigation that did not find evidence of data exfiltration. Restoration efforts gradually returned the reservation system and most affected servers to normal operation while employee and supplier payments remained largely unaffected, and the agency communicated progress through regular public updates.

Structurally, STM is a municipal agency owned by the City of Montreal, reporting to the city’s executive committee and ultimately accountable to the municipal council. The agency’s capital projects are funded through a combination of municipal contributions from the City of Montreal, provincial grants from the Ministère des Transports du Québec and revenue generated from fares, advertising and commercial rentals. STM also participates in intermodal initiatives, such as integrating bike‑share stations at metro stations and providing secure parking for cyclists, to encourage first‑ and last‑mile connections and reduce reliance on private automobiles.