For the more than 75 lakh Mumbaikars who use local trains for their daily commute, the intervening night of June 6 and June 7 will be a momentous one. The journey of the 1,500-volt DC system, which has been powering trains since 1925, will end on Central Railway and a 25,000-volt AC system will take its place.

The city will, in all likelihood, however, remember the event not for its historic significance but for the chaos that is likely to follow it. This paper had reported yesterday that CR officials feared the cancellation of 40 services an hour from Sunday, something that would have crippled the network and given rise to severe problems for commuters.