The Toronto subway isn't all underground - first off, nobody tell Rob Ford; if he finds out he may decide it's part of the war on the car and start making plans to tear it up. Though most of the surface-running segments are in Etobicoke, North York, and Scarborough, there's a small bit in Toronto itself between Bloor Station and Summerhill Station where you can watch the trains without those tunnels getting in the way.
From the bridge that carries Roxborough Street East over the trench the subway runs in, you can see straight into Rosedale Station. Here, I caught a northbound Yonge-University-Spadina train (you know, as opposed to all those Sheppard trains that run on the Yonge-University-Spadina line) during its brief stop there; the station's not used much, and it's rare if trains loiter for as long as ten seconds at the platform.
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