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Originally Posted by zzptichka
Original Hurdman looked like this. Wonder why they ditched island platform design. Isn't it cheaper and better in general?

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Island platforms used to be at almost every station but they ditched them, including in the downtown tunnel.
It doesn't really matter too much for the most part. What's cheaper depends on how the line is set up. For the downtown tunnel, side platforms are absolutely cheaper but elsewhere it would depend.
I highly suspect that accessibility factored in. In Toronto there's been recent blow-ups about how centre platform stations are less accessible to the blind, and IIRC there was threat of lawsuits over island platforms in new subway stations a couple years ago... RTG may be wanting to avoid that.