Surging river waters have so far affected 17 million people in the eastern state of Bihar, officials say.
Over a million have been displaced in India, Nepal and Bangladesh, with aid workers warning of acute food shortages and water-borne diseases in the affected areas.
More than 16 million people have been affected by floods across India, Bangladesh and Nepal, aid workers and officials said, as heavy rains and damaged roads continued hamper relief efforts.
Three days of heavy rainfall, flash floods and landslides have left hundreds of people homeless and without food. Officials have warned that the death toll could rise as the extent of the damage becomes clear.
Children have played on the railway since it was closed for an upgrade in January 2014, but now people are excited for the new train.
Floods that have hit India's eastern region have put women and children at a higher risk of being preyed upon by human traffickers.
Persistent heavy rains during the monsoon season in India have triggered floods that have caused the deaths of more than 50 people, leaving thousands more sheltering in makeshift camps.
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