The woman's purse has been recovered, police said, refusing to divulge further details.
The woman, Sudhir Bansal, was accompanying her son, Gaurav, who recently enrolled in Delhi University, to help him find accommodation.
They boarded the Yoga Express from Rajasthan. Sudhir was standing near the door of a compartment. When the train slowed down near the Mithai Pul, on the way to the railway station, a person caught hold of her bag, the police said.
Bansal's son tried to save her but was unsuccessful. She died while being taken to a hospital.
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