Metro is one of the best passenger vehicles runs on rails for public transport in many cities. For example, Delhi Metro is a world-class metro. To ensure reliability and safety in train operations, it is equipped with the most modern communication and train control system. It has state-of-art air-conditioned coaches. Ticketing and passenger control are through Automatic Fare Collection System,. Metro generally travels underground (in Western countries) but at some places it also runs on elevated tracks.