Indian Railways is a state-owned enterprise that operates one of the largest railway networks in the world, comprising over 115,000 km of track across India. It transports over 8 billion passengers annually. Key stations include Chhatrapati Shivaji Terminus in Mumbai, formerly known as Victoria Terminus, and Southern Railway headquarters in Chennai. The network is divided into 16 zones that are further divided into divisions and overseen by general managers. Delhi Metro is India's first modern public rapid transit system and has revolutionized travel in Delhi and surrounding areas.