The three, Alekh Tanti, S Mukhi and Jiten Lama were working near the Laxmidunguri level crossing between Sambalpur junction and Hirakud stations when a goods train knocked them down, the sources said.
Tanti and Mukhi were gangmen and Lama was working as a contractual worker.
Senior officials, including additional DRM, Sambalpur, Jyotindra Diggi visited the spot along with RPF and GRP personnel.