Mumbai Suburban Railway 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 465 kilometres (289 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 and it has the most severe overcrowding in the world. Trains run from 04:00 until 01:00, and some trains also run up to 02:30.
In 2017, MMRDA announced it is investing up to ₹48,000 crore to re-haul the entire rail network by introducing new services, coaches, signalling equipment.
