As for acceleration, generally it's a trade-off between that and top speed. Top speed is more important on longer semi-fast and express runs. But the lower acceleration means losing time in the central tunnel.
Obviously you can't stick *current* commuter trains into the tunnels, which is why I said at the outset that this sort of improvement involves new commuter trains.
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Depends what you mean by "subway like frequencies". Certainly not 36 an hour!
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To the best of my knowledge there are no frequencies that high anywhere on the T...even in Tokyo: Odakyu only recently moved up to 36 an hour (from 24) and that's on a 4-track line! But the current frequency is around 1 or 2 an hour, and there's a lot of room between 1 and 36
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The Victoria line is now 36 (at peak), I believe. With two tracks.
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The busiest subway line in Tokyo (Marunouchi Line) peaks at 33 trains per hour iirc. I don't know of any that go higher than that, but I may be forgetting something. Moscow Metro tops out at 40 per hour (90 second headways)
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Admittedly these are short (133 metres) and small trains. Not full size as in Tokyo.
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Marunouchi Line is also kind of short by Tokyo standards if memory serves--platforms aren't as long as on other routes
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Tube trains always have been short. And the Vic was built during a 1960s economy drive.
End of conversation
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