That is the basic function of commuter trains, yes. But their service can be expanded to near-mass transit frequencies. The Long Island RR in NY is a commuter railroad that also functions as a quasi-rapid transit system outside the city.Metrolink is a "suburban" train, a commuter train. When you board one of these the idea is that you are either going to or coming back from work. Burbank should be mature enough to understand that the lure of free parking only creates more traffic that its streets cannot handle.