Come to think of it, is there any streetcar ROW in the city, in-use or planned that also has curb-separated bike lanes?
College Street
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In general, though, it will not be done, because the ROW on most routes is insufficiently wide to allow for it.
Which is to say, on for example, (most) of Queen, if you did this, you would have to remove the curb lanes for cars entirely (forcing any cars on to the streetcar tracks) which would slow transit and cars.
The width of most curb lanes on streetscar routes is such that if you placed bike lane/cycle track to the trackside, you'd be putting cyclists between the door zone and the tracks. Bike and tracks don't mix well and streetcars can't do evasive action nor stop quickly.
If you placed the cycle track to curbside, you'd have cars regularly encroaching into streetcar row and holding up service, especially in winter.
That said, you will see an expansion of cycle tracks on College, in all likelihood, as the councillors support it.
It can certainly be done, but we would have to be ready to completely dump parking on all streetcar routes (which I favour, btw), but i don't think the politics are there for it......... yet.
It might also require some further innovation.