Outage held up more than 350 million trains in the region , Indian railway spokesman says . Officials say it affected at least 300 states in northern Shinde , home to seven people . Power was partially restored after 2.35 a.m. , authorities said . Blackouts become more common during summer every year when demand shoots up .
Outage held up at least 300 trains in the region , Indian railway spokesman says . Officials say it affected seven states in northern India , home to more than 350 million people . Power was partially restored after about six hours , authorities said . Blackouts become more common during summer every year when demand shoots up .