"I did not travel in the said train on that date," Alam, son of senior RJD MP and former union minister Mohammed Taslimuddin, told PTI when he was contacted for his reaction.
The third-term MLA said a political conspiracy has been hatched against him.
"I request the media to ask the complainant if they met me on the train...When I was not travelling in the train how come they met me and (so) the question of my touching and abusing the man and his wife does not arise," Alam said.
Meanwhile, a team under Sub Inspector Rekha Kumari today left for Mughalsarai and Delhi to record statements of the RPF officials present in the train and the complainant couple, Superintendent of Police, Railways, P N Mishra told PTI.
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A list of co-passengers would also be collected by the probe team for more information on the episode.
An FIR was lodged yesterday against the JD(U) MLA on the basis of a complaint received by RPF from a passenger, Indrapal Singh Bedi, for allegedly forcibly evicting him from his seat and abusing him and his wife when they protested.
Bedi in his written complaint to RPF had stated that the incident occurred an hour before the train reached Patna on Sunday night.
The RPF team which received the complaint onboard returned to Patna yesterday and an FIR was registered with GRP Patna this morning, the SP said.