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Don't trains usually have to accommodate the potential for standing passengers and thus have to have a much smoother acceleration curve than is strictly necessary for car comfort?
I would expect that trains have to accommodate the fact that they're trains as well. I would expect trying to stop/start a train traveling at 60mph without damaging the tracks on which it runs would require rather more time than a car.
This may be another reason to use roundabouts instead of stop lights or stop signs at intersections.