Editing Line 4 Sheppard (section)

===Eastward extension===
The TTC considered the eastward extension of the Sheppard line to Scarborough Centre station as one of its top priorities for rapid-transit expansion, which would have expanded [[rapid transit]] in [[Scarborough, Ontario|Scarborough]] for the first time since the completion of [[Line 3 Scarborough]].<ref name="TO-2017-11">{{cite web |date=November 2017 |title=Sheppard East Subway Corridor Secondary Plan |url=https://www.toronto.ca/wp-content/uploads/2017/11/9805-cp-official-plan-SP-9-SheppardEast.pdf |url-status=live |archive-url=https://web.archive.org/web/20210307124632/https://www.toronto.ca/wp-content/uploads/2017/11/9805-cp-official-plan-SP-9-SheppardEast.pdf |archive-date=March 7, 2021 |access-date=February 15, 2021 |publisher=[[Municipal government of Toronto|City of Toronto]] |quote=This secondary plan is based on the following assumptions: a) that a Sheppard Subway has been constructed with stations at Don Mills Road, Leslie Street, Bessarion Road, Bayview Avenue and Yonge Street, and that a future station may be constructed at Willowdale Avenue; and, b) that Sheppard Avenue will be widened to seven lanes from Beecroft Road to Leslie Street}}</ref> In 2015, the TTC estimated that a Sheppard subway to Scarborough Centre would have 7,800 riders per hour while 10,000 per hour was the minimum number of riders per hour considered appropriate for a subway. The maximum capacity of the subway option was about 30,000 riders per hour, approximately the load the Yonge portion of Line 1 carried in the morning rush.<ref name="TorStar20150518" />

In April 2019, the provincial government under Premier Doug Ford announced that it supported an eastward extension of Line 4 but included no promise of funding nor a proposed target date for completion. The province revised the proposed route to terminate and meet a then-proposed [[Scarborough Subway Extension]]<!--Don't bypass redirect per [[WP:NOTBROKEN]]--> of [[Line 2 Bloor–Danforth]] at Sheppard Avenue East and [[McCowan Road]] instead of at Scarborough Centre.<ref name="CBC-2019-04-04"/> The announcement noted that construction of the line would not begin until the 2030s, following the completion of the Scarborough Subway Extension.<ref name="CBC-2019-04-04" /> 

In November 2023, Metrolinx announced preparation of an initial business case for Line 4 extensions as previously supported in April 2019, and that it was also considering a further extension of Line 4 east of McCowan Road to Meadowvale Road as part of the study limits<!--Don't mention the Toronto Zoo despite its proximity-->.<ref name="Metrolinx-2023-11-14" /> In June 2024, Metrolinx held several public consultations with routing concepts.<ref name=":2">{{Cite web |title=Learn more about the Sheppard Subway Extension. |url=https://www.metrolinx.com/en/projects-and-programs/sheppard-extension/events/sheppard-extension-consultations-june-2024 |access-date=2024-12-11 |website=www.metrolinx.com |language=en}}</ref>