My Alerts As a public transit corporation, the Société de transport de Montréal (STM) is central to sustainable development in the Montréal area. It operates, maintains and develops an efficient, integrated métro and bus network for a fair price. With close to 11,000 dedicated employees and partners, the STM offers users safe, reliable, efficient, user-friendly and accessible transit service. The STM is the third largest public transit corporation in North America, after New York and Toronto. Its métro has four lines that serve 68 stations and cover 71 kilometres of underground tunnels while its bus network has 2,000 buses that cover 500 square kilometres on the Island of Montréal. Its annual budget amounts to $1.7 billion. The STM ensures more than 80% of the public transit trips in the Montréal region.