There is no reason why you can't move the Mayfield station to the NYC, NKP or PRR mainlines. It could stand in for a suburban station where LD trains would stop in stead of making the long trip downtown. You could decide if another town (Aurora) was at the start of the commuter district or if Mayfield (Naperville, La Grange) has an old station to sell tickets.
Commuter trains use F's or GP's with 2-3 heavyweight coaches & 1 combine for the mail & newspaper baggage. (The first train outbound delivers the AM paper. It needs to be OT for commuters to buy it at the station).
Some LD trains stop so that passengers don't have to make the long trek downtown. LD trains stop only to pickup/drop passengers for far away cities. The 20century Limited stops at the wrong time of day. Something called the Pacemaker stops during daylight hours. The train can be heavy with baggage, express & mail with a few coaches. You can have a mix of heavyweight & lightweight coaches, lounge cars, tavern cars, etc.
Commuter trains use F's or GP's with 2-3 heavyweight coaches & 1 combine for the mail & newspaper baggage. (The first train outbound delivers the AM paper. It needs to be OT for commuters to buy it at the station).
Some LD trains stop so that passengers don't have to make the long trek downtown. LD trains stop only to pickup/drop passengers for far away cities. The 20century Limited stops at the wrong time of day. Something called the Pacemaker stops during daylight hours. The train can be heavy with baggage, express & mail with a few coaches. You can have a mix of heavyweight & lightweight coaches, lounge cars, tavern cars, etc.