Suburban train movement is very different form Express/freight train movement. A pair of lines called dedicated suburban corridors with a station every 1-3 kms should be constructed along all the directions in Megacities like Bangluru, Hyderabad, Ahmedabad, Pune etc which can ensure a 9/12 coach train every 2.5-3 minutes in each direction. It may take ground route and go elevated/UG if land not available as encroachment of Rly land had been a big impediment for rly projects.