Though the first electric motor unit (EMU) local train first chugged off from platform 1 at Chhatrapati Shivaji Terminus (CST) in 1925, which is now used for running suburban services on Harbour line till Panvel, it will be the last of three railway lines to get technical upgradation. As per the plans chalked out by the Central Railway (CR), the process of power upgradation from the existing 1,500-volt Direct Current (DC) to 25,000-volt Alternating Current (AC) on the Harbour line will take place only in the first quarter of 2015.

CR officials say one of the main problems for power upgradation is unavailability of trains that can run on DC/AC current. File pic