Editing Line 3 Scarborough (section)

===Revitalization and expansion<span id="Proposed expansion"></span>===
{{Line 3 Extension}}
In 2006, a study was completed on the prospects of the Scarborough line.<ref name="2006SRT">{{cite web |url=http://www3.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2006/Aug_30_2006/Other/Scarborough_Rt_Strat.pdf |title=Scarborough RT Strategic Plan |access-date=March 9, 2012 |date=August 30, 2006 |archive-date=August 26, 2014 |archive-url=https://web.archive.org/web/20140826120731/http://www.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2006/Aug_30_2006/Other/Scarborough_Rt_Strat.pdf |url-status=dead}}</ref><ref name="2006Strategic">{{cite web |url=http://www.toronto.ca/ttc/pdf/scarborough_rt_strategic_plan_study_report.pdf |access-date=August 5, 2013 |date=August 2006 |title=Scarborough RT Strategic Plan – Study Report – Final Report – August 2006 |url-status=dead |archive-url=https://web.archive.org/web/20080625121344/http://www.toronto.ca/ttc/pdf/scarborough_rt_strategic_plan_study_report.pdf |archive-date=June 25, 2008}}</ref> It recommended upgrading the line to handle larger Innovia Metro Mark II vehicles, at a cost of $190{{nbsp}}million (in 2006 dollars) with an eight-month service suspension for the upgrade and to purchase $170{{nbsp}}million of new rolling stock.<ref name="TTC-2006-09-20" /> Rebuilding the curve in the tunnel north of Ellesmere station would have been required to accommodate Mark II cars. (According to transit advocate [[Steve Munro]], the need to rebuild the tunnel was discovered after the $190{{nbsp}}million upgrade estimate was made.<ref name="G&M-2017-03-17">{{cite news |url=https://www.theglobeandmail.com/news/toronto/what-went-wrong-since-the-golden-age-of-toronto-transit/article34321708/ |title=What has gone wrong since the 'golden age' of Toronto transit |newspaper=[[The Globe and Mail]] |first=Oliver |last=Moore |date=March 17, 2017 |access-date=April 24, 2017 |quote=Dr. Richard Soberman, former chair of civil engineering at the University of Toronto, would simply buy new rolling stock for the SRT and rebuild a bend to accommodate new vehicles. |archive-date=April 22, 2017 |archive-url=https://web.archive.org/web/20170422123418/http://www.theglobeandmail.com/news/toronto/what-went-wrong-since-the-golden-age-of-toronto-transit/article34321708/ |url-status=live}}</ref><ref name="SteveMunro-2017-03-01">{{cite web |url=https://stevemunro.ca/2017/03/01/scarborough-subway-cost-rises-again/ |title=Scarborough Subway Cost Rises Again |last=Munro |first=Steve |author-link=Steve Munro |date=March 1, 2017 |access-date=April 24, 2017 |quote=At the time [the report] was written, the cost estimate was $360{{nbsp}}million. ... At this point it was assumed that the larger Mark II Skytrain cars would fit through the Ellesmere tunnel, but this was optimistic. |archive-date=April 6, 2017 |archive-url=https://web.archive.org/web/20170406022719/https://stevemunro.ca/2017/03/01/scarborough-subway-cost-rises-again/ |url-status=live}}</ref>) The TTC Board approved the recommended plan for the upgrades on August 30, 2006,<ref name="TTC-2006-09-20">{{cite web |url=http://www.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2006/Sept_20_2006/Minutes/index.jsp |title=Minutes of the Previous Meeting – Board Meeting Minutes – Meeting No. 1873 – Wednesday, August 30, 2006 |access-date=December 1, 2015 |date=September 20, 2006 |archive-date=December 8, 2015 |archive-url=https://web.archive.org/web/20151208082823/http://www.ttc.ca/About_the_TTC/Commission_reports_and_information/Commission_meetings/2006/Sept_20_2006/Minutes/index.jsp |url-status=live}}</ref> but later cancelled the plans.<ref name="TheStar-2015-11-15" /> Extending Line 2 Bloor–Danforth, either along the current route or along a different alignment directly to Scarborough Centre station, was not considered cost-effective or justifiable.

In November 2015, transportation consultant and [[University of Toronto]] professor emeritus Richard Soberman argued that it would be vastly cheaper and faster to buy new Line 3 vehicles than to replace Line 3 with an extension of [[Line 2 Bloor–Danforth|Line 2]] northeast from Kennedy station. He felt the cost savings would be great enough to overcome difficulties such as the incompatibility of Mark II cars with the existing line geometry and the extra cost of building a fully separated right-of-way to Sheppard Avenue, where Line 3 could connect with either a proposed [[Line 4 Sheppard#Eastward extension|extension of Line 4 Sheppard]] or the [[Sheppard East LRT]].<ref name="TheStar-2015-11-15">{{cite news |url=https://www.thestar.com/news/gta/transportation/2015/11/15/skip-the-scarborough-subway-and-modernize-the-srt-says-transit-expert.html |title=Skip the Scarborough subway and modernize the SRT, says transit expert |newspaper=[[Toronto Star]] |first=Tess |last=Kalinowski |date=November 15, 2015 |access-date=November 20, 2015 |archive-date=November 18, 2015 |archive-url=https://web.archive.org/web/20151118224540/http://www.thestar.com/news/gta/transportation/2015/11/15/skip-the-scarborough-subway-and-modernize-the-srt-says-transit-expert.html |url-status=live}}</ref>