Police in Rushcliffe are appealing to the public for information.
A spokesperson said:
‘At around 14.30 on Saturday the 22nd August three white male teenagers, (14 to 15 years old), two with bicycles were recorded on CCTV walking along the railway line from the station at Gotham Road to the railway signal box at Hotchley Hill.
‘A door was forced to gain entry followed by the mindless destruction of items in the ground-floor room, they then went up to the first floor and removed boards leaving dangerous holes in the floor.
‘All of this activity was recorded by CCTV at the British Gypsum factory adjacent to the site.
‘Yesterday (6th Sept) the second break-in occurred, on this occasion, heavy floorboards were unscrewed and removed leaving a very deep pit open.
‘A screwdriver left at the scene by the offenders on this occasion is currently being examined for fingerprints and DNA. We are currently awaiting the CCTV of this offence.
‘This signal box is currently being renovated by the Great Central Railway, a charitable organisation staffed by volunteers, there is currently no electricity or lights at this signal box so the removal of the floorboards could easily have caused serious injury or death to one or more of the volunteers.
‘This railway line, although classified as a ‘Heritage Line’ is still used by British Gypsum and is therefore like all active railway lines, a very dangerous place for anyone to trespass on.
‘Local residents are asked to help identify these youths and also to remind their children of the dangers of trespassing on railway property.