The incident occurred at an unmanned level-crossing on the outskirts of Sambalpur district headquarters, about 320 km from here when the auto, packed with passengers, was trying to cross the track.
The auto was hit by the Rourkela-Bhubaneswar Intercity Express.
Six people died in the accident, a police officer told IANS from the spot.
Photos: Shah Rukh Khan, Shweta Bachchan at Karan Johar's book launch
Photos: Sunny Deol with sons Karan and Rajvir at Mumbai airport
Photos: 10 beautiful moments that capture winter around the world
Photos: Karisma Kapoor, Preity Zinta, Shraddha Kapoor at Mumbai airport
Spotted: Anushka Sharma and Diljit Dosanjh at Mumbai studio