A warning was issued by police after reports of increasing numbers of people walking along a railway line in Nottinghamshire.
Rushcliffe South Police, which cover Radcliffe, Bingham, Cotgrave, Leake and Keyworth, said people were using the Great Central Railway line as a trail.
The force said people were using the tracks as a line of communication between Ruddington and East Leake.
Although the tracks are currently not used by the usual heritage locomotives, a number of non-passenger services still use the route when leaving the Midland main line.
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The force said: “It is not acceptable to enter a railway line, even if it appears to be closed.
“It’s an intrusion and it could lead to a serious accident.
“For your own safety and to make sure young people are not encouraged to think of the train tracks as a place to walk or have fun, please stick to the many public trails that are found in the area.”
The Great Central Railway, which runs past Rushcliffe Country Park, is home to the Ruddington Heritage Railway.
It once shared Victoria Station with the Great Northern Railway, but when they came out of the tunnel that passed under the Lace Market at Weekday Cross Junction, they parted into two lines, on high-level arched viaducts over Broad Marsh and Arkwright Street.
Much of the GCR main line was closed by British Rail in 1968, but a ten-mile stretch of the line is now operated by the heritage group Great Central Railway (Nottingham).