The Mumbai Suburban Railway (Marathi: मुंबई उपनगरीय रेल्वे) (colloquially called local trains or simply locals) consists of exclusive inner suburban railway lines augmented by commuter rail on main lines serving outlying suburbs to serve the Mumbai Metropolitan Region. Spread over 390 kilometres (240 mi), the suburban railway operates 2,342 train services and carries more than 7.5 million commuters daily. By annual ridership (2.64 billion), the Mumbai Suburban Railway is one of the busiest commuter rail systems in the world. Trains run from 04:00 until 01:00, and some trains also run up to 02:30. It is the first suburban rail network in India.