T Tracker is a clean, minimalist app with real time arrival times for the Boston T heavy rail lines. Pull out the sliding menu to choose your stop and get going. It tracks the Red, Orange, and Blue Lines

If it can determine your location immediately, T Tracker will automatically bring up arrival times for the nearest station. Otherwise, it will go straight to your default stop. Never again should you have to experience the painful irony of missing your train because you spent time checking when it was going to arrive!