Front railfan window view from an early morning inbound METRA Naperville Express train on the Aurora Line (aka BNSF Line aka Chicago Sub). This train is .brRear view from an outbound early morning METRA train on the Aurora Line (aka BNSF Line aka Chicago Sub). Most of these trains run express to Downers .brTrain 1: BNSF GEVOs #6386 and 6191 bring a coal train off the Chicago Sub and onto the Mendota Sub at South Aurora. Train 2: A little later, four Dash-9s- .brA great day, though a little slow for freight traffic, on the BNSF Chicago Sub Racetrack out of Chicago, at La Grange, Illinois. Freight traffic is seen not only on .