The girl, who went missing on Friday last, lost her legs when she fell from the train at Ramganga station yesterday, they said.
A complaint has been lodged against one Satyaveer by the girl's brother Chandrapal, police said, adding that Satyaveer was arrested today.
Meanwhile, Satyaveer claimed that the girl went with him willingly, but her mind changed at the last moment and she jumped from the train and lost her legs.