…something also easier with trains running emergency schedule?
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Of course, that requires digging 4 tunnels, which is really expensive unless you're doing cut-and-cover and also requires a rather wide right-of-way.
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you can run four tracks in a single tunnel if you're so inclined, and there's no rule stipulating that such a thing must be underground, but more to the point: you can run high frequency express and local service variants on a two-track line if a few stations on it have 4 tracks
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heck, the stations part is optional if the overall line isn't too long
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That's basically called Caltrain and that exact service pattern coupled with the state banning level boarding for wheelchairs was why I had a 52 minute gap between trains in the mornings.
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wait wait wait Cali BANNED high platforms?
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but regardless I'm not talking about how C*ltrain fucks things up I'm talking about actual high frequency service on a mixed service pattern on a mostly-or-entirely two-track line, which I have observed in Japan
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RIght, but I was at the station that got screwed because of how the express trains stacked up coming out of SF. They're leaving SF pretty constantly, and the only way to not have intersections was to hit me 8 and 52 minutes apart. Burlingame AM, headed south, 2017 schedule.
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route is probably too long not to have a few stations with extra platforms for overtakes
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