The Railways has lodged a complaint against 'unknown persons' for the seizure and release of Bhubaneswar-Delhi Rajdhani Express in West Midnapore district on Tuesday.
Superintendent of Railway Police Saugata Sen said on Wednesday that the complaint was lodged by Government Railway Police (GRP) at Jhargram in the district Tuesday night.
The complaint was against "unknown persons" and did not name anyone, he said.
Armed members of the People's Committee against Police Atrocities, believed to be around 400 in number, ordered the two drivers of the train to alight and not to take it forward after they brought it to halt placing a tree branch on the tracks at Banstala, 10 km from Jhargram station.
The activists had also taken away the drivers which held up the train for seven-and-a-half hours, while the pantry car and passengers luggage were reportedly looted.
The drivers were accused by the agitators of running the train when an indefinite bandh against "atrocities" by the joint forces during the anti-Maoist operations in troubled Lalgarh.
The train left after the joint forces arrived at the spot late in the evening after the agitators withdrew.
The bandh which began yesterday was continuing with PCPA members torching a car at Kushabani forest for defying the shutdown, police said.
In Kolkata, Chief Secretary Asok Mohan Chakraborty held a high-level meeting.