"Prima facie it appears that the cause behind the mishap was heavy rains that was never witnessed in the Harda region in the recent memory. Due to it, base material under the tracks got washed out and the overhead contact of the engine got disconnected, because of which the trains got stranded on the tracks over the bridge on Machak river," Chouhan said here.
"Because of heavy weight of the train the tracks got pushed down and swollen river water entered into the bogies," Chouhan told reporters after visiting the mishap site, about 25 kms away from here.
"25 passengers were killed in the mishap and 50 others injured," he maintained in the presence of West Central Railway (WCR) General Manager (GM) Ramesh Chandra.
12 bodies were found inside the derailed train bogies, he said.
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A government spokesperson, however, earlier said the death toll in the twin train tragedy stood at 29.
He also informed that 11 bodies have been identified and their autopsy will be done in Harda only. The unidentified ones will be taken to Bhopal for postmortem, he added.
Chouhan also said that people from five villages near the mishap site have done a commendable job and would be rewarded for their services during the Independence Day on August 15.
Meanwhile, Railway Minister Suresh Prabhu and his deputy, Manoj Sinha have reached Bhopal but got stuck at the Bhopal Airport due to bad weather and were unable to fly in a chopper to the mishap site.
Road connectivity to the site has been cut off again due to the downpour.