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[quote user="daveklepper"]Why not use tram-trains for the planned electrfication, like Kartsruh's?   Then use the existing streetcar and munimentro tunnel tracks to get the San Jose trains downtown, with equipment that can go 125 mph on high voltage overhead grade separated high speed track but can also behave like a PCC in traffic.[/quote]Good question.... The idea is great, but so far there are no trains which have the acceleration of a light rail vehicle with the top speed of HSR. The Karlsruhe-trains make 100 kph (62 mph). Even if someone starts to develop such a train for 125 mph it will take years until it sees passengers. Besides, I don't think that it is possible. Electric motors have a lot of advantages compared to combustion engines, but they can't work wonders. I have to admit that I can't think of a reason why, but so far I never saw an electric motor used for high acceleration and high speed at the same time.
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