Editing Barrie line (section)

====Davenport Diamond grade separation====
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| caption   = Location of Davenport Diamond in Toronto
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| label     = Davenport Diamond
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| mark-title = Davenport Diamond
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The Davenport Diamond was an at-grade rail-to-rail crossing of the GO Barrie line and east–west [[Canadian Pacific Railway|CP Rail]] North Toronto subdivision tracks near Davenport Road in Toronto. It was one of the busiest train intersections in North America.<ref name="metrolinx.com">{{Cite web|title=Metrolinx: For a Greater Region - Davenport Diamond: Guideway & Greenway|url=http://www.metrolinx.com/en/greaterregion/projects/davenport-diamond.aspx|access-date=2020-06-29|df=mdy-all|website=www.metrolinx.com|archive-date=June 24, 2020|archive-url=https://web.archive.org/web/20200624122833/http://www.metrolinx.com/en/greaterregion/projects/davenport-diamond.aspx|url-status=dead}}</ref> In order to increase service frequency on the Barrie line, GO Transit identified the need to remove the diamond and build a grade separated crossing. In 2015 Metrolinx initiated a Transit Project Assessment Process (an environmental assessment process specific to transit projects) based on the preferred option of constructing an overpass to carry the GO line over the east-west CP Rail line.<ref name="metrolinx.com"/>

The grade separated crossing (which Metrolinx calls the Davenport Diamond Guideway<ref name="Metrolinx-2022/03/22">{{cite web |url=https://blog.metrolinx.com/2022/03/22/upcoming-bloor-bridge-reconstruction-means-full-road-and-sidewalk-closures/ |title=Upcoming Bloor bridge reconstruction means full road and sidewalk closures |publisher=[[Metrolinx]] |date=March 22, 2022 |archiveurl=https://web.archive.org/web/20220325165246/https://blog.metrolinx.com/2022/03/22/upcoming-bloor-bridge-reconstruction-means-full-road-and-sidewalk-closures/ | archivedate=March 25, 2022 |url-status=live }}</ref>) is on a {{convert|1.4|km|1|adj=on|abbr=}} long, {{convert|8.5|m|adj=on}} high rail bridge. It lies between Bloor Street West and St. Clair Avenue West parallel to Lansdowne Avenue. The bridge will allow GO Transit to run all-day, two-way service on the Barrie line without freight traffic disruptions. The 2015 estimated cost of the project was $120 million.<ref name=TheStar-2015-08-07>{{cite news |url=https://www.thestar.com/news/gta/transportation/2015/08/07/go-gives-city-more-time-to-consider-giant-rail-bridge.html |title=GO gives city more time to consider giant rail bridge |newspaper=[[Toronto Star]] |author=Tess Kalinowski, Transportation reporter |date=August 7, 2015 |access-date=2016-03-31 |df=mdy-all}}</ref><ref name=TheStar-2015-11-17>{{cite news |url=https://www.thestar.com/news/gta/transportation/2015/11/17/metrolinx-to-move-ahead-with-giant-davenport-rail-bridge.html |title=Metrolinx to move ahead with giant Davenport rail bridge |newspaper=[[Toronto Star]] |author=Tess Kalinowski, Transportation reporter |date=November 17, 2015 |access-date=2016-03-31|df=mdy-all}}</ref>

The project began construction in 2017.<ref name="metrolinx.com"/> The Davenport Diamond Guideway went into service on Monday April 3, 2023, and the grade-level Davenport Diamond went out of service on the prior weekend. The ground-level track approaching the diamond will be removed.<ref name="Metrolinx-2023-04-04">{{cite web |url=https://www.metrolinx.com/en/news/go-trains-now-traveling-across-davenport-diamond-guideway |title=GO Trains now traveling across Davenport Diamond Guideway |publisher=[[Metrolinx]] |date=April 4, 2023 |archive-url=https://web.archive.org/web/20230405034202/https://www.metrolinx.com/en/news/go-trains-now-traveling-across-davenport-diamond-guideway | archive-date=April 5, 2023 |url-status=live }}</ref>{{needs update|date=April 2024}}

At the same time of building the guideway, further community improvements were added in the immediate vicinity, including noise wall and bearing pads, a rail overpass above Wallace Avenue and a pedestrian underpass at Paton Road, as well as a replacement of the Bloor Street West bridge.<ref>{{Cite web|title=Davenport Diamond: Guideway|url=http://www.metrolinx.com/en/greaterregion/projects/docs/davenport/Project-Backgrounder-Davenport-Diamond_V7.pdf|access-date=June 29, 2020|archive-date=June 30, 2020|archive-url=https://web.archive.org/web/20200630230937/http://www.metrolinx.com/en/greaterregion/projects/docs/davenport/Project-Backgrounder-Davenport-Diamond_V7.pdf|url-status=dead}}</ref>{{better source needed|date=April 2024|reason=Published well before project completion. A newer source is needed.}}

Other grade separations are planned. One was completed at Rutherford Road immediately north of [[Rutherford GO Station]],{{sfn|GO Transit|2020}} and another is planned at McNaughton Road north of [[Maple GO Station]].{{citation needed|date=April 2024}}