Canadian Railroads > Amtrak/VIA Maple Leaf detours

What type of work is taking place?  Is GO Transit also affected?  Is the detour over the freight line from Burlington that goes up near McMillan  Yd?
Thanks
AndyMaple Leaf Service Adjustments, March 8-9

• Train 63, which normally operates between New York and Toronto, connecting with VIA Service Train 7098, will operate on a detour bypassing Oakville, ON, with no alternate transportation provided. Delays of 40 minutes should be expected.
• Train 64, which normally operates between Toronto and New York, connecting with VIA Service Train 7097, will operate on a detour bypassing Oakville, ON, with no alternate transportation provided. Delays of 40 minutes should be expected.

Metrolinx (GO Transit) owns the Oakville Sub. and therefore is responsible for maintenance.  The closure of this line occurs approximately every few months.  I don't know what work in particular is being done.  It is west of Oakville.The reroute of VIA trains will indeed be from Burlington Jct. up the CN  Halton Sub. through Milton and onto the so-called "north main line" near Georgetown and down to Union Station.

GO often closes the Oakville Sub. all the way from Union Station to Burlington Jct., but this time GO trains will run between Union Station and Oakville.

https://www.gotransit.com/en/the-future-and-go/construction-notices/march-7-9-lakeshore-west-service-adjustment