I think the idea is that the HSR trains will crawl up the Peninsula, facilitated by warp speed on other parts of the line like the Central Valley and even the mountain crossings. If you reduce the speed differential between HSR and Caltrain on the shared segment, you can run a pretty dense schedule with only one or two overtakes needed.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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