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Early this month, the Chicago Transit Authority (CTA) plans to launch a pilot version of "Train Tracker" through a dedicated website.

Customers using desktop computers or mobile devices such as iPhones, BlackBerries or smart phones will be able to obtain estimated arrival times for trains on all eight rail lines via the online tool.

Estimated arrival times will be reported through a combination of scheduling information and data from the CTA's QuickTrack program.

To view estimated arrival times, riders can go to the website, select a preferred rail line and choose a station. Arrival times of trains approaching every 15 minutes will be provided for the station, and results will refresh every 20 to 30 seconds.

As part of the Train Tracker pilot, electronic signs at 10 CTA stations also will feature arrival information either on the platform or mezzanine levels.