The incident happened when a herd of 13 elephants was crossing a rail track between the forest reserves of Thrikonamadu and Madura Oya in the Welioya area.
Elephants are considered a national treasure in the island nation with legal protection. The estimated elephant population in the country is under 8,000.
In a similar case last month, two baby elephants and their pregnant mother were killed after they were hit by a train transporting oil.
Following the incident, the engine drivers were instructed to move slow and sound the horn continuously to warn the elephants off the track.
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