Editing Line 4 Sheppard (section)

===Completion and opening===
[[File:Sheppard Yonge Platform 02.jpg|thumb|left|The roughed-in [[Spanish solution]] island platform in [[Sheppard–Yonge station]]]]
The Sheppard line was opened on November 22, 2002. It was the city's first new subway line since the opening of the [[Line 2 Bloor–Danforth|Bloor–Danforth line]] in 1966.<ref name="star2016">{{cite web |url=https://www.pressreader.com/canada/toronto-star/20161119/282656097044749 |title=November 22, 2002: The Sheppard Subway Line opens its doors |work=[[Toronto Star]] |date=November 19, 2016 |first=Sophie |last=Van Bastelaer |access-date=November 21, 2016 |archive-date=November 21, 2016 |archive-url=https://web.archive.org/web/20161121171806/https://www.pressreader.com/canada/toronto-star/20161119/282656097044749 |url-status=live}}</ref> It remained the newest subway infrastructure in Toronto for 15 years until the opening of the [[Toronto–York Spadina subway extension]] in 2017. It is shorter than had been planned, running from [[Yonge Street]] (at the former Sheppard station, renamed Sheppard–Yonge when the Sheppard line opened) east to Don Mills Road rather than further west to [[Sheppard West station|Downsview station]] (renamed Sheppard West in May 2017 to prevent confusion with [[Downsview Park station]]) and southeast to the former [[Scarborough Centre station]]. Downsview station had been built in 1996, ostensibly with the intention of being the western terminus of the Sheppard line before the line was truncated.

The Sheppard line cost just under [[Canadian dollar|C$]]1{{nbsp}}billion and took eight years to build. It is the first subway line in Canada that had plain tunnel sections built entirely by [[tunnel boring machine]]. The Sheppard line is the only subway line in Toronto that does not have any open sections. All stations on the line were constructed using the [[cut-and-cover]]<!--Don't bypass redirect per [[WP:NOTBROKEN]]--> method, with the expansion of Sheppard station having required an S-shaped diversion of Yonge Street during construction. Just east of [[Leslie station]], there is an enclosed concrete bridge over the east branch of the [[Don River (Ontario)|Don River]].

It was the first line to have accessible elevators at every station.<ref name="star2016" /> The automated system to announce each station was installed in January 2006.

Its stations were built to accommodate the TTC's standard subway trains of six {{convert|23|m|ft|0|adj=on}} cars, but part of each platform was blocked off since only four-car trains are needed to carry the amount of traffic on the line. The line was designed so that it can be extended at both ends, allowing for the construction of westward and eastward branches that had been planned. Likewise, the Sheppard line level of Sheppard–Yonge station was constructed with a roughed-in [[Spanish solution]] platform layout in anticipation of increased ridership, though in practice, the island platform is unused and only has advertising on the columns.

[[Platform screen doors]] were proposed for the Sheppard line. Installed at the edge of the platforms, platform screen doors would have aligned themselves with the subway-car doors when trains were in station for safety and suicide prevention. The proposed system was dropped because of its cost.