Greenline is a free iPhone app that allows users to track the real-time arrival predictions and locations for all MBTA Green Line trains. With its sleek and intuitive design, Greenline provides a convenient and user-friendly experience.

Upon opening the app, Greenline quickly identifies the nearest station and provides the estimated time until the next train arrives. Additionally, users can view the current location of the train on a map, allowing for easy navigation and planning.

One of the standout features of Greenline is its interactive map, which allows users to watch as Green Line trains move across Boston. This not only provides a visual representation of the train's progress, but also adds an element of engagement and entertainment while waiting for your train.

Furthermore, Greenline offers a unique feature that allows users to share their train location with friends. This can be particularly useful when meeting up with friends, as they can track your progress and plan accordingly.

Greenline relies on real-time vehicle prediction and location data provided by the MBTA, ensuring accurate and up-to-date information for users.

Overall, Greenline is a reliable and user-friendly app that provides real-time tracking and information for MBTA Green Line trains. Whether you're a daily commuter or a visitor exploring Boston, Greenline is a valuable tool for navigating the city's public transportation system.