The Toronto subway and RT is the main rapid transit (RT) railway system in Toronto, Ontario, Canada operated by the Toronto Transit Commission (TTC). Since the original line following Yonge Street opened in 1954, the network has expanded to become Canada's longest rapid transit rail network, encompassing four lines and 69 stations on 68.3 kilometres (42.7 miles) of track; this includes the RT's 6 stations with 6.4 kilometres (4.2 miles) of track. The subway system is a very popular mode of public transport in Toronto and the largest in Canada in terms of passenger usage, with an average of 1,186,050 passenger trips each weekday (as of 2005-2006).