The government railway police (GRP) at CST recently arrested a gang of eight in connection with a human trafficking case unearthed last month.
A source said a relative of alleged mastermind Amit Anil Ram Chaudhary (37) helped police crack it.
The trafficking came to light after three Bangladeshi minors were found roaming at CST on April 18.
Police said four Bangladeshi minor girls were brought to Mumbai last month and handed over to Chaudhary,who sells cosmetics in red light areas.
The source said since Chaudhary worked in red light areas,he was aware of the demand for girls and would meet it.
Of the four minors,two were allegedly held captive in a rented apartment at Diwa by Chaudhary and Mona Mukadar Molangi (30) alias Mona Chaudhary who pretended to be a married couple.
One of the minors was allegedly taken by Chaudhary and Vikas Kumar Rama Sahu (27) to a red light area in Grant Road. When she raised an alarm,Sahu and one Surendra Parmeshwar Ravidas (29) took her and a second minor to a hotel in Dombivali and allegedly forced them into prostitution.
At the hotel,there was another Bangladeshi girl and they fled to CST during transit. Hotel manager Suresh alias Suraj Kashyap was also arrested. With the help of the girls,police traced Chaudhary and Molangi.
A team later went to Kolkata to arrest Molai Madan Vishwas (40),Gurudas Anil Das (26) and Sunai Ramesh Singh (19) who allegedly took charge of the girls after they were brought to India.
Police estimate the prostitution racket was operating for at least four years and several Bangladeshi minors were lured to Mumbai promising jobs as domestic help.