The engine hit the elephants, including a pregnant one, who were crossing tracks in Potiyapam area of Kampur killing two of them on the spot. The third jumbo succumbed to its injuries later, a district administration official said.
Forest Minister Pramila Rani Brahma directed the Forest Department to file an FIR against the railways alleging that they have failed to take the issue of elephants crossing train tracks seriously.
The forest minister also directed the railways to limit speed of trains to 15 km/hour.
Train services were affected following the incident as Dibrugarh-Delhi Rajdhani Express, Dibrugarh-Bangalore Express and Dibrugarh-Howrah Kamrup Express and Delhi-Dibrugarh Brahmaputra Mail were halted at several places. The trains resumed their journeys after the tracks were cleared, a North East Frontier Railway spokesman said.
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"The railways maintains speed restrictions of 40 km/hour in areas earmarked as elephant corridors but this particular area between Jamunamukh and Kampur railway stations is not earmarked as a notified elephant corridor by the Forest Department," the spokesman added.
Forest Department and wildlife NGOs have been asked to provide details of movement of elephant herds and in addition to lowering of speed limit of trains from sunset to sunrise, railway staff were also being sensitised, the spokesman added.
Eleven elephants have been killed by trains during the month with seven in the same district, others in neighbouring Karbi Anglong and one in Bongaigaon district.