It’s always the same: A system run at the boundary of its maximum throughput is brittle. Tiny disturbances cascade and you get large fluctuations. I have the

It’s always the same: A system run at the boundary of its maximum throughput is brittle. Tiny disturbances cascade and you get large fluctuations. I have the standing hypothesis that there is a second order phase transition between free flowing trains and total collapse where the control parameter is the train density. I just cannot identify the correct order parameter.