EMU only for Sub-urban Railway system & will have halts at Sub-urban high level platfroms only having platfrom height=84 cm from the base of the tracks as EMU coaches don't have stairs+ EMU coaches are wider, having a width of more than 12 feet so can't run on mainline tracks having less passing distance b/w adjacent tracks. MEMU for Mainline operations, just a multiple unit alternative for regular passnger train.