...is easy to miss.
You have to go south on Edwin, which is just east of the underpass after Annette becomes Dupont. There's a bike lane even though it's a one way for cars going north. At the end of Edwin, shimmy right to the railpath instead of following the road to the left.
You can hammer along that to Dundas.
It's a sneaky little guy, eh?
It is. There's an access point at the tracks on the north side, but you'd have to lug your bike up a flight of stairs.