The Indian MP, locally known as an MLA, who was spotted walking in a moving train in his undergarment, was drunk, according to a co-traveller.
The passenger has also accused him of snatching his gold ornaments after he objected to MLA Gopal Mandal's display, reports NDTV.
The passenger, Prahlad Paswan, has lodged a complaint against the MLA from Bihar Chief Minister (CM) Nitish Kumar's party, Janata Dal-United, at a Government Railway Police station in Delhi.
"The MLA was drunk when he was roaming the coach in a white vest and underwear," Paswan said in his complaint, adding, when he confronted Mandal, "the MLA snatched my gold ring and chain and misbehaved with me."
The bizarre scene unfolded in the AC First Class compartment of Patna-New Delhi Tejas Rajdhani Express on Thursday.
After registering the complaint, the Delhi Police transferred the case to Bihiya GRP near Arrah in Delhi for further investigation as it falls under that jurisdiction.
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Earlier in the day, the MLA from Gopalpur in Bhagalpur district blamed his upset stomach for his inappropriate clothing choice after his photo in them went viral on social media.
"I was in an underwear and vest. I had just boarded the train and had an upset stomach. I do not lie," said the MLA.
Even photos of him roaming the train coach in a white vest have been widely shared on social media.
Elaborating the series of events, the MLA said that a man stopped him and questioned him over his attire. "I shoved him away and after relieving myself I confronted him," he said.
The lawmaker also denied the allegations that his attire made female passengers uncomfortable and claimed there was no woman present in the compartment.
Meanwhile, CM Nitish Kumar on Saturday said an investigation is taking place into the incident of the MLA roaming in his undergarments during a train journey.