When the transfer option isn't convenient enough to be a major draw. Bloor-Lansdowne GO station will be located
south of Bloor, two blocks west of Lansdowne. Which is not where the subway station is. Transfering from GO to TTC would involve a 350-metre walk including at least two roadway crossings, at least one of which is signalized. So you're looking at 4-5 minutes walking between the stations, in addition to up to 4 minutes walking down the GO platform and a couple minutes getting in/out of the subway station.
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The odds of such a long transfer actually being part of a traveller's best option from A to B are relatively low, especially given the convienent transfers available to the same GO line at Union, Caledonia and Downsview Park. It seems like a somewhat useful station, but it doesn't seem so important that we need to stop every single train there on its 100 km journey to Barrie.
For reference, the transfer will be longer than the walk from Dundas West TTC to Bloor GO - a walk which seems to be long enough to dissuade most transfer activity.
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I expect that we will see a big increase in transfers between Bloor GO and Dundas West TTC once the tunnel opens to connect the railway station to the east end of the subway platforms.