It's a bit different because you have much bigger tunnels, longer platforms and fewer and further between stations. And less frequent trains (RER C in Paris is particularly bad for that).
Train suspension (re: jolting) has little relation to the number or doors or the rate of acceleration--as for seats, you get better results with high frequency than with fewer doors. High acceleration is important at any distance, especially if you want high overall speed!
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You get more seats per metre of train length, and a less draughty carriage, with fewer doors.
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True enough. Are these worth handicapping the entire line for, though? They seem appropriate as a premium service--making up a certain portion of trains per hour (as with Keikyu's 2100 series) or carriages per train (as with JR East's Green Cars), not for every car of every trainpic.twitter.com/AkXRaqRrUm
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