The former MP was, however, set free within hours of being detained after the girl withdrew her complaint, police said today.
62-year-old Chandra Nath Singh was deboarded from the train at Shahjahanpur Railway Station late last night after the woman alleged the former MP from Machlishahr misbehaved with her and was in an inebriated state, police said.
Initially, there was some dispute over a berth in AC first class as the former MP boarded the train without a confirmed ticket, they said.
Soon after his detention, the SP leader complained of pain in the chest after which he was admitted to the district hospital, police said.
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The matter is being investigated by police and the victim has lodged a written complaint, they said.
However, she later withdrew her complaint.
"The girl has sent a fax to District Magistrate withdrawing her complaint against the former MP," SHO GRP, Shahjahanpur, SP Yadav told PTI.
When asked about the incident, SP spokesman and cabinet minister Rajendra Chowdhury said, "The matter is not in the knowledge of the Chief Minister".