The incident took place near the Adalpur Halt when the five women were crossing the tracks on their way home after taking bath at a nearby ghat, Munger Superintendent of Police Ashish Bharti said.
The women, who were from a neighbouring village, must have failed to notice the approaching Bhagalpur-Danapur Intercity train due to heavy fog in the morning, Mr Bharti said.
Four of them died on the spot and another received serious injuries, he said.
The injured woman has been taken to Munger Sadar Hospital.
Soon after the accident, angry villagers came to the spot and squatted on the tracks, preventing the bodies from being removed, the Superintendent of Police said, adding that efforts were being made to pacify the locals.
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