NorthShore
Conductor
I really don’t think the Milwaukee predicament is much of an issue. It’s almost impossible to totally fill a train the whole length of the route. If it becomes concerning to the states involved, they will employ the same sort of fare management that Amtrak employs for the LD trains that sell space on the on the NEC, pay to add cars, or take one of many cheaper, less time consuming, actions possible . Cutting cars on a corridor train is, I think, total overkill. Next commuter trains will be cutting cars.
Commuter trains used to cut cars. Dinkys with one engine and one gallery car could be seen on outlying branches of Metra, leaving the rest of the coaches behind at a major interchange station.