Additional District Judge Satya Prakash found Mukesh Yadav, Pappu Yadav, Arun Yadav and Raja Yadav guilty under section 376 (2) (g) of IPC and awarded them life imprisonment.
The court also slapped a fine of Rs 10,000 on each convict.
The incident had occurred on late October 13 night, 2010 when the woman got down from Maurya Express at Dhanbad railway station and took an auto for Nutandih.
A total of six persons, however, took her to Dhangi Pahdi region and raped her.