Comment by max76

I think you misunderstand Brasess' Paradox. It is when adding to a system decreases the efficiency of the system by adjusting the Nash equilibrium to be further from the optimal system wide solution. "Reducing congestion increases congestion" is a not a logical statement.

My comment left the possibility of Brasess' Paradox open in the specific Detroit case, but practically speaking commuter trains are used by most major cities worldwide as part of a comprehensive transportation system. For many cities rail is among the most efficient subsystems of their transportation system.