The CTA Train Tracker API allows for querying near-real-time arrival times of Chicago Transit bus trains. The API is in beta and receives arrival time predictions via the QuikTrak rail system monitoring software (trains not currently GPS enabled). Each query responds with predictions for all platforms at a given train station in an XML document.
The following is a list of how-to and tutorial content that matched your search term. ProgrammableWeb's how-to content comes from two sources; full-blown tutorials that we publish ourselves and other highly relevant tutorials that we find elsewhere on the Web. This list represents on combination of both tutorial types and if you go to ProgrammableWeb's API University, you'll not only be able to find more, they are organized based on your role (API providers or developers who consumes APIs). If you know of a tutorial that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.