Editing Line 1 Yonge–University (section)

=== Line ===
[[File:Line 1 track at Davisville 2023.jpg|thumb|left|An open-cut section looking south to [[Davisville station]]]]
The line is mostly underground but has several surface sections between Sheppard West and Eglinton West, and between Bloor–Yonge and Eglinton. Most of the line between Bloor–Yonge and Eglinton stations was originally constructed in open cut, with the short section between {{stl|TTC|St. Clair}} and {{stl|TTC|Summerhill}} stations having since been covered over. Evidence of this can be seen in the tunnel: there are no columns or walls between tracks, and ballast and drainage ditches are present, something not seen in the rest of the subway system. There are also tree stumps and the stubs of lamp posts in the tunnel. There are also clues outdoors: seemingly unnecessary railings along the sides of a nearby street, which was once a bridge over the tracks, and empty lots following the trains' right-of-way marked with signs warning heavy vehicles and equipment to keep off because they might fall through to the columnless tunnel below.

Most of the tunnel was constructed by a cut-and-cover method, but some sections were bored, as noted below. All stations, whether by transfer or fare-paid terminal, connect to surface TTC bus and/or streetcar routes. Other surface and train connections are noted below.

Since 1996, TTC stations have been built or modified with elevators, ramps and other features to make them accessible to all.<ref>{{cite web|title=Milestones|url=http://www.ttc.ca/About_the_TTC/History/Milestones.jsp|access-date=February 5, 2017|work=ttc.ca|publisher=Toronto Transit Commission|quote=1996: Downsview Station, Bloor-Yonge Station, and Union Station become the first accessible subway stations.|archive-date=May 6, 2021|archive-url=https://web.archive.org/web/20210506024157/http://www.ttc.ca/About_the_TTC/History/Milestones.jsp|url-status=live}}</ref> {{as of|2022|1|df=us}}, 30 stations on the line are [[Toronto Transit Commission accessibility|fully accessible]].<ref>{{Cite web|title=Accessibility – Elevators and Escalators|url=http://www.ttc.ca/TTC_Accessibility/Easier_access_on_the_TTC/Elevators_and_escalators.jsp|access-date=April 8, 2021|website=[[Toronto Transit Commission]]|language=en|archive-date=April 14, 2021|archive-url=https://web.archive.org/web/20210414191915/http://www2.ttc.ca/TTC_Accessibility/Easier_access_on_the_TTC/Elevators_and_escalators.jsp|url-status=live}}</ref> All stations on the line are projected to be made accessible by 2025, as per the [[Accessibility for Ontarians with Disabilities Act, 2005|Accessibility for Ontarians with Disabilities Act.]]<ref>{{Cite web|title=Projects – Easier Access – Easier Access Program Schedule|url=http://www.ttc.ca/About_the_TTC/Projects/Easier_Access/Easier_Access_Schedule.jsp|access-date=April 8, 2021|website=[[Toronto Transit Commission]]|archive-date=April 20, 2021|archive-url=https://web.archive.org/web/20210420224246/http://www.ttc.ca/About_the_TTC/Projects/Easier_Access/Easier_Access_Schedule.jsp|url-status=live}}</ref>

Because the line opened in sections from 1954, it has a relatively high number of [[Toronto subway trackage#Diamond crossovers|crossovers]], which were mostly constructed at terminal stations to turn back trains.<ref name=":0">{{Cite web|date=January 17, 2021|title=Detailed map of Toronto Underground & Tramway|url=http://cartometro.com/cartes/metro-tram-toronto/|access-date=April 8, 2021|website=Carto Metro|archive-date=April 16, 2021|archive-url=https://web.archive.org/web/20210416103424/http://cartometro.com/cartes/metro-tram-toronto/|url-status=live}}</ref> There are 17 diamond crossovers located between the service tracks along the length of the line. There are also eight [[Toronto subway trackage#Storage tracks or centre tracks|storage tracks]], which can also be used for reversals.<ref name=":0" /> The high number of possible turnbacks gives the TTC more flexibility when planning maintenance or in the event of an emergency service disruption.<ref>{{Cite web|last=Torontoist|date=May 11, 2015|title=Torontoist Explains: Subway Shutdowns|url=https://torontoist.com/2015/05/torontoist-explains-subway-shutdowns/|access-date=April 8, 2021|website=Torontoist|archive-date=April 14, 2021|archive-url=https://web.archive.org/web/20210414144415/https://torontoist.com/2015/05/torontoist-explains-subway-shutdowns/|url-status=live}}</ref>