Four persons, all natives of Bihar, were arrested for allegedly placing stones on the railway track between Erode and Uttukuli stations, on Wednesday.

West Zone Inspector General of Police P. Sivanandi told reporters here on Thursday that a special squad, which was formed following frequent incidents of trains running into boulders on the track, arrested Hargesh (19), Manoj (22), Bijesh Yadav (23) and Ruthal Yadav (45), who were working in a poultry farm at Pungampadi.

“The four used to place stones on the track and watch trains running into them. They were doing this just for fun,” Mr. Sivanandi said.