Fun Facts Mumbai has the second biggest film producing companies in the world. In 2020 Mumbai will have 27 million people in it. They hold the record for the highest amount of rainfall in a city in one day 942 mm. They have a festival on a party street called Ganesh Chathurti which holds millions of people. Mumbai's original name was Bombay. Everyday in Mumbai more than 200 trains make more than 2000 trips. Mumbai's trains carry 200,000 lunches every day and deliver them around the city.