Because of the Superliner cars, I assumed this train was the Texas Eagle. According to the Amtrak schedule, the Texas Eagle is due at Joliet at 2:40pm. Since the time stamp on the following picture is 2:50pm, I believe the Texas Eagle assumption is correct.
Below shows the trains first stop so that passengers could load the front part of the train. You can see that there is construction in progress. The Amtrak platform is being moved from the west side of the tracks to the east side of the tracks so that the passengers do not have to cross the BNSF/SantaFe tracks to get to the CN+UP/GM&O trains. Note that the "dome car" is still north of the platform near the old signal bridge.