There are a number of ways to increase Union Station's capacity, one of which is to stop terminating trains there by interlining once service goes two-way all-day. "SmartTrack" for example turns the Kitchener and Stouffville lines into just one line, so no more shutting down for half an hour for them. There are other approaches that should also be investigated. We published a couple of stories detailing some of them a couple of years ago, here, and here.
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