The Toronto subway and RT is the main rapid transit (RT) railway system in Toronto, Ontario, Canada. It is run by the Toronto Transit Commission (TTC). Since the first part under Yonge Street opened in 1954 with 12 stations, the system has grown to be Canada's biggest rapid transit rail system. It has four lines and 69 stations on 68.3 km of track. The subway system is used very often and has the most number of passengers of any system in Canada. It has an average of 948,100 passenger trips each weekday (as of 2010).