I believe that to solve this problem, metros in paris have two strategies: -1 a train that has a train too close before it will idle between stations to restor

I believe that to solve this problem, metros in paris have two strategies: -1 a train that has a train too close before it will idle between stations to restore a reasonable space between trains (problem: all trains go as slow as the "first" train) -2 a train that has train too close after it will ask all travelers to step out at a station to wait for the next train, then skip a couple of stations to restore a good space between trains (problem: people in the "scarified" train get a big delay)