On the home stretch into Chicago. We will arrive about 40 minutes late. Over all a great trip.
I spent 5½ hours making a circle trip on the RTD rail system -- made some stops and took in the new Southeast 2.3 mile extension -- around the time that you were arriving in Chicago. It was a quiet afternoon due to the weather forecasts and no major afternoon Sunday bread and circus events. Come back again (and testing is getting started on the N-Line, so there'll be more to see, including the longest rail bridge in Colorado).
With more time there's the option of riding CHI > RAT > DEN and seeing more of the Front Range and Raton Pass.