Overcrowding
Due to its extensive reach across the Mumbai Metropolitan Region, and its intensive use by the local urban population, overcrowding has grown to be a compelling problem (4,700 passengers are packed into a 9-car rake during peak hours, as against the rated carrying capacity of 1,700). This has resulted in what is known as Super-Dense Crush Load of 14 to 16 standing passengers per square metre of floor space. Trains on the suburban line are on average more than 4 minutes apart, contributing to the problem of overcrowding. The impending introduction of new higher speed rakes may help address the issue.
Fatalities
Yearly more than 3,500 people die on the Mumbai suburban railway track due to overcrowding during peak hours. This is believed to be the highest number of fatalities per year on any urban or suburban railway system. Many of these deaths are caused when passengers cross the tracks on foot, instead of using the footbridges provided for going from one platform to another, and are hit by passing trains. Some passengers die when they sit on train roofs to avoid the crowds and are electrocuted by the overhead electric wires.