Toronto operates a subway on three different routes:
The Yonge Line, operating from Union Station up Yonge Street to Eglinton, opened in 1954 and was eventually extended, in stages over a number of years, to Finch Avenue in the former City of North York.
The University Line runs from Union Station up University Avenue until Bloor and then west to Spadina, where it continues north to the former Downsview military based (now public a park) as the Spadina Line. The University and Spadina Lines connect at Union Station with the Yonge Line allowing a continous operation from Downsview south to Union Station and then up to Finch Avenue. The University Line opened in 1963, and the Spadina Line in two stages, up to Wilson Avenue in 1978, and to Downsview in 1996.
The Bloor-Danforth Line opened between Keele Street in the west and Woodbine Avenue in the east in 1966. Two years later, it was extended, to Islington Avenue in the west and Warden Avenue in the east. In 1980, it was extended to its current end points - Kipling Avenue in the west, and Kenneday in the east.
The Sheppard Line opened in late 2002. It runs from the Sheppard-Yonge station east to Don Mills Road. This is the only part of Toronto's subway system that currently uses a four car consists - all others were converted to six-car consists a number of years prior to this. It is a very short line, with only six stops, and although originally planned to end at the Scarborough Town Centre, it was over budget so was stopped at Don Mills instead. While it is possible for the Sheppard Line to be extended to Scarborough Town Centre, other ideas are currently being built (such as an extension of the Spadina Line to York University), and there is talk about a downtown relief line as well as an extension of the Yonge Line to Richmond Hill. However, there has been talk of an LRT connecting the Sheppard Line to Scarborough Town Centre.
Toronto subways use 86 class H-4,136 class H-5, 126 class H-6, and 372 class T-1 style cars. The class H-4 has 77 seats and was built by Hawker-Sidley in 1974 and 1975. The class H-5 has 76 seats and was also built by Hawker-Sidley between 1976 and 1979.
Toronto Rocket #5521 brings up the rear of a southbound subway train at Queen Street subway station on December 18th, 2015.