In most/all cases, I would think the answer would be 'No'.............. however....
GO's page on its officers says this:
View attachment 586446
IF they have the authority to enforce drug laws, the criminal code and the mental health act............ they would almost certainly have 'arrest powers' depending on what it is they choose to charge you with.
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They are designated as 'special constables'.
And Mx does indeed assert their powers of arrest:
View attachment 586447
From:
Taking a moment to show support to all the men & women in uniform whose job it is to keep us safe.
www.metrolinx.com