Posted Aug 1, 2015, 6:42 PM
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power to the people!
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Join Date: Oct 2008
Location: Crescent Heights, Calgary
Posts: 864
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6% grades are a nightmare for high-rail maintenece vehicles, especially near tunnel heads in the winter where track frosting occurs due to air temperature variance. Runaways are common during these conditions and someone is eventually going to get killed.
For this reason alone, I'd choose option D.
As for deep stations, they're not a far-fetched concept. They built 10 storey deep stations in London 100 years ago.
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