In a move that could revolutionise transportation in India's business capital, the Mumbai Metropolitan Region Development Authority (MMRDA) has planned a 450-km long network of metro rail corridors for the city and surroundings - the third largest in the world, a top official said here Thursday.

The Mumbai Metropolitan Region (MMR), which comprises Mumbai and parts of adjacent Thane, Palghar and Raigad districts, is aimed to get metro rail connectivity which will be next only to Shanghai and Beijing.