I keep saying it, we need trains with sections that can detach to stop at stations (and reattach at the next passing train after leaving the station) :). Btw,

I keep saying it, we need trains with sections that can detach to stop at stations (and reattach at the next passing train after leaving the station) :). Btw, does anybody know what is the marginal energy cost of a single car added to a train running at constant speed?