
Metrolinx is extending GO Transit’s 09 Lakeshore East line to Bowmanville, as part of the GO Expansion Program.
Metrolinx has started “early-works” construction for the Bowmanville extension project. It’s replacing the Simcoe Street Bridge over the Canadian Pacific Kansas City Railway (CPKC) Belleville subdivision tracks in Oshawa. The bridge is more than 100 years old and nearing the end of its service life. The new bridge will be higher and longer and Metrolinx will realign it “to meet current engineering standards.” It’s also expanding the rail corridor in the area and adding a new GO train track.

^ An aerial view of where the work will be taking place. Image, Metrolinx
Since Monday, January 12, the Region of Durham has closed:
- Simcoe Street South [Regional Road 2] between Avenue and Albany streets
in the City of Oshawa to accommodate the work.

Metrolinx explains that “This closure is necessary to ensure the safety of both the public and crews as they work on multiple construction activities,” including:
- demolishing and removing the old bridge structure;
- installing new foundations and piling to support the new bridge; and
- completing other road and utility works resulting from the project.
Durham Region Transit has been detouring buses along these routes, while the street is closed:
Starting Monday, July 13, DRT revises the detour paths due to another construction project that blocks Park Road South.

GO Transit started detouring its buses Saturday, January 3 to prepare its passengers for the construction. GO buses along these routes are detouring:
- 52 Oshawa / Vaughan;
- 56 Oshawa / Oakville; and
- 92 Oshawa / Yorkdale.
Construction of the Simcoe Street South bridge and the resulting DRT and GO detours continue “for approximately two years,” meaning as late as until January 31, 2028.
Metrolinx and GO plan to accommodate more passengers and increase service along the Lakeshore East line, as part of the GO Expansion Program (formerly “regional express rail”).