The 16-year-old victim, who belongs to Tarwari area, was rescued by railway police personnel from the Karnal railway station, where she had been dumped by one of her tormentors.
She underwent a medical examination, police said.
The girl told police that she was taken by a man, who was her friend and had promised to marry her. She alleged that later, 11 other men came and raped her Friday and Saturday.
Police officials in Karnal, 130 km from here, said that the main accused, who was a friend of the victim, had been arrested.
Police sources said that most of the other accused had also been detained.
Haryana has seen a spurt in rape cases, especially against minor and Dalit girls, since September this year.