Editing Line 3 Scarborough (section)

===Opening and service===
[[Image:TTC UTDC ICTS Mark I 3012.jpg|thumb|left|An [[S series (Toronto subway)|S-series]] train in its original (1985–2015) livery in 2006]]
The Scarborough line was formally opened (as the Scarborough RT) to invited guests on March 22, 1985, and began revenue service on March 24, 1985.<ref>{{cite news |last1=James |first1=Royson |title=Rapid transit line hailed at opening |work=Toronto Star |date=March 23, 1985 |page=A3}}</ref> Three years after it opened, the TTC renovated its southwestern terminus at Kennedy station because the looped turnaround track, designed for uni-directional streetcars under the earlier plan and not needed for the bi-directional ICTS trains, was causing derailments; it was replaced with a single terminal track and the station was thus quasi-Spanish solution, with one side for boarding and another side for alighting, though the boarding side is also used for alighting during off-peak hours, weekends and holidays.

With the line approaching the end of its useful life,<ref name="CEO Nov 2012 Report">{{cite web |url=http://www.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2012/November_21/Supplementary_Reports/CHIEF_EXECUTIVE_OFFI.pdf |title=Chief Executive Officer's Report – November 2012 Update |publisher=Toronto Transit Commission |date=November 21, 2012 |access-date=March 10, 2013 |archive-date=February 22, 2014 |archive-url=https://web.archive.org/web/20140222032218/http://www.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2012/November_21/Supplementary_Reports/CHIEF_EXECUTIVE_OFFI.pdf |url-status=live}}</ref> the TTC reduced the frequency of service in mid-September 2012 to reduce wear and tear on both the aging rolling stock and the infrastructure.

In 2015, the TTC started work on the cars to keep them operational until the line is replaced by another mode of rail technology. This included [[Vehicle vinyl wrap|shrink-wrapping the rolling stock with a blue vinyl finish]] to emphasize the line's colour and displaying the number 3, a linear diagram of the Scarborough line, and the TTC logo.<ref name="This is what the TTC's revamped SRT cars look like">{{cite web |title=This is what the TTC's revamped SRT cars look like |url=http://www.blogto.com/city/2015/03/this_is_what_the_ttcs_revamped_srt_cars_look_like/ |work=BlogTO |access-date=March 10, 2015 |archive-date=March 8, 2015 |archive-url=https://web.archive.org/web/20150308174020/http://www.blogto.com/city/2015/03/this_is_what_the_ttcs_revamped_srt_cars_look_like/ |url-status=live}}</ref> The original "RT" logo was no longer featured on the trains, except when the Line 3 shrink wrap is removed but not re-applied yet. These were followed by interior upgrades, such as using coloured velour seating.

On December 13, 2016, [[Presto card|Presto]] fare gates were installed at [[Lawrence East station]], making all stations along this line Presto-enabled.<ref>{{cite web|url=https://www.prestocard.ca/en/about/presto-on-the-ttc|title=Presto on the TTC|access-date=March 30, 2019|archive-date=March 30, 2019|archive-url=https://web.archive.org/web/20190330144838/https://www.prestocard.ca/en/about/presto-on-the-ttc|url-status=live}}</ref>

On April 18, 2017, the TTC awarded a $6.8-million contract to [[Bombardier Transportation|Bombardier]] to repair corrosion damage under the floors of the [[S series (Toronto subway)|S-series]] cars. If the problem were not rectified, there would be the risk of serious structural damage to the cars. That would have prevented the cars from lasting until 2026 when the [[Line 2 Bloor–Danforth#Scarborough Subway Extension|Scarborough Subway Extension]] was originally scheduled to replace Line 3. The repair work required service to be reduced from 6 four-car trains down to 5.<ref name="TheStar-2017-04-18">{{cite news |url=https://www.thestar.com/news/gta/2017/04/18/scarborough-rt-vehicles-need-repairs-to-avoid-catastrophic-corrosion-failures.html |title=Scarborough RT vehicles need repairs to avoid 'catastrophic' corrosion failures |newspaper=[[Toronto Star]] |first=Ben |last=Spurr |date=April 18, 2017 |access-date=April 19, 2017 |archive-date=April 18, 2017 |archive-url=https://web.archive.org/web/20170418215925/https://www.thestar.com/news/gta/2017/04/18/scarborough-rt-vehicles-need-repairs-to-avoid-catastrophic-corrosion-failures.html |url-status=live}}</ref>