The north south length of the island mumbai is more . The central railway passes through the place of brahma of mumbai city . Therefore the railway board gets less profit from the central railway and even it is not developed to the extent . The western railway passes through the western part of mumbai . The west is the direction of air therefore fast moving vehicles have progressed in the western direction . As more sea is on the west of mumbai the western suburbans have also progressed more than the eastern suburbans .