The girl jumped before Ajmer-Amritsar Express train near village Chak Hakeem between Phagwara-Chaheru rail section on the intervening night of Monday-Tuesday, local government Railway Police Post (GRP) in-charge Gurbhej Singh said.
She was identified as Amandeep Kaur, resident of local Urban Estate and was pursuing B Com, he said.
The body was handed over to her family members after post mortem, Singh said.
A case under section 174 of CrPc was registered in this regard, he added.