The mysterious glow has been puzzling people living in the county. But now, Network Rail - the company that looks after most of Britain's railways - has explained where it's been coming from.
The year 1975 was significant for a lots of reasons. It saw the fall of Saigon (marking the end of the Vietnam War), Margaret Thatcher became the leader of the Conservatives, and Steven Spielberg's ...
It may look like "something from the X-Files", but Network Rail has offered a rational explanation.