Stranded passengers wait for train services to resume following a power outage in New Delhi, India, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without government-supplied electricity for several hours in one of the world's biggest-ever blackouts. Hundreds of trains stalled across the country and traffic lights went out, causing widespread traffic jams in New Delhi. (AP Photo/Rajesh Kumar Singh)
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