Metra Train Tracker does not get data unless somebody requests it. That means if you are the first person to request information from station A to station B, you will only see the latest 3 departures. As trains depart, the next 3 departures from station A will be retrieved, and the departed train will be updated with arrival information. Now, the next person who requests data from A to B will now see 4 trains - the departed train, and the next 3 departures.

Note: All train departure data is obtained through Metra's website. Arrival information is calculated from the departure times from the intermediate stations on the train's route. You may occasionally see unusual train schedules - this is an issue with Metra's data, not the application.

If you like Metra Train Tracker, consider supporting the developers with the paid version. Thanks!