All the nine persons were rushed to the Railway Hospital, where doctors referred them to M G M Hospital, said a GRP officer.
The victims were travelling in S-7 coach and had boarded the train from various stations including Mumbai and Kurla.
A youth had boarded the train at Gondia and befriended them soon, the GRP officer said adding that the youth offered them cold drink allegedly laced with sedatives.
The passengers fell unconscious after consuming the drink and the youth decamped with their belongings including cash, jewellery, mobile phones, clothes, the officer said.