CTA Train Locator helps you find the closest train station. For instance, if you are looking for the Blue line, you can select that and the app will help you find the closest Blue line to your location. You can also select that you wish to find any train, and it would find the closest station of all.
The app provides you with the distance and the map directions to the train. It updates the map as you walk. You can update how often you are updated in the preferences tab.
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