The two birds had strayed onto the track area of the high-speed line between Kassel and Göttingen in central Germany “during an excursion”, according to Kassel police.
One of the birds died, likely after getting caught in the overhead power cables, said the statement on the December 23rd incident, which was made public late on Monday.
Its companion then sat beside the body in mourning, resisting attempts by officials to lure it away and temporarily closing the line to traffic.
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Firefighters with special equipment were later called in and managed to lift the dead swan and its surviving companion away from the area.
Twenty-three trains were delayed for about 50 minutes while the rescue operation took place, the police statement said.
The surviving swan was unharmed and later released onto the river Fulda, it
According to Britain's Royal Society for the Protection of Birds, swans try to find a mate for life.