Back in December, the MTA unveiled a new smartphone app that provided up-to-the-minute tracking for seven New York City transit lines. The backend data would also be made available to developers, MTA officials said at the time, and three months later you can now find live schedule info in Google Maps. As before, only the 1, 2, 3, 4, 5, 6, and 42nd Street Shuttle lines are supported — upgrading NYC's entire subway system for tracking will be a multi-year effort that demands "hundreds of millions" of dollars. But for anyone that rides these trains daily, it's an incredibly convenient addition.

In partnership with the Utah Transit Authority, Google has also added schedule data for buses and trams throughout the greater Salt Lake City area. Metrorail riders in Washington, DC now have access to live service alerts, as well. The added transit information is available through Google Maps on the desktop, Android, and iOS starting today.