Three empty coaches of the Chandigarh-Amritsar train, that were stationed at a service lane in the railway yard in Daria village here, derailed at about 12:30pm on Sunday.
One out of the three wagons was luggage and the remaining were air-conditioned coaches. The wagons were not attached to the train at the time of the incident.
According to Chandigarh railway station superintendent RK Dutta, the coaches were on an inclination and began moving on their own.
AK Satpal, divisional railways manager (DRM) at the Ambala division of the Northern Railways, said safety norms mandated that wagons stationed on inclined tracks must be chained.
“Preliminary investigation reveals that coaches were not chained and safety norms were not followed. A committee has been constituted to inquire into the incident. Strict action will be taken against those found guilty,” he said.