Alt least 17 cows including calves were killed when a passenger train ran over them near Dhanubhanga village, about 10 km from Dhupdhara in Goalpara district, on Sunday afternoon. The tragic incident occurred on the Guwahati Bongaigaon railway track in Dhanubhanga-Letekupara area. The animals, after grazing at the nearby agriculture filed, were crossing the rail track to return home when the incident happened, local sources said. "We are poor people. The cows were our livelihood sources," one of the farmers and owner of the killed cows said.