Delhi Metro Rail is a free iPhone app developed by Sudhir Mittal, providing customers of metro services with a plethora of useful information. The app is a comprehensive guide for the metro services, offering various sections to access information. The app is designed to help users use the metro services with ease and convenience.

The app features a "Route Between Stations" section, where users can select the starting and destination stations, and the app will display the Fares, Distance, Approximate Travel time, stations in between with change over station and the route map with plotting of the route on the map. Another section, "Station Info," provides various useful information about the station, such as first and last train timings, platforms, gates and directions, contact numbers, tourist spots near that station, parking, feeder services, etc. The "Nearest metro station" section helps users find the nearest metro stations from their current location.

In addition, the app offers other sections such as Tour guide, Metro Museum, Lost and found, and Other info, which provide users with various other useful information. Delhi Metro Rail is a must-have app for anyone who wants to use the metro services with ease and convenience.