Farzana, 20, was killed by three of her family members who were against her inter-caste marriage to Shabir, 26.
"The victim's relatives kept chasing the couple, following which the two jumped off a moving train", Ejaz Ullah, a police officer from Sahiwal, said.
The family later convinced the woman to return to the town, where in front of the panchayat the two conflicting tribal clans accepted the marriage.