This was interesting, Stephen Ree's blog:
Quote:
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As for platform lengthening, it’s not in the cards for the underground platforms, which are already 50 metres. Like you, I thought I had detected how this could be done, so I asked a senior source at InTransitBC, who confirmed to me last week that the underground stations are not designed to be extended. The elevated and at-grade stations have 40-metre platforms and those could be extended to 50 metres. Use of a centre car would involve selective door opening, with the doors at the extreme front and rear ends kept closed by the computer control system.
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I don't think that's accurate at all, the stations from Broadway to Langara are definitely not 50-metre platforms.
Why would selective door opening be required if its a 15-metre middle C-car? All the doors would still be on the platform, but barely...which makes the case of trains having to stop at precise location on the platform.