This app was mentioned in 2 comments, with an average of 1.00 upvote
Ride Metra https://play.google.com/store/apps/details?id=com.jerrellmardis.ridemetra
Depot (CTA and Divvy) https://play.google.com/store/apps/details?id=com.barsbay.transittrackerchicago
https://play.google.com/store/apps/details?id=com.jerrellmardis.ridemetra