A grey wheelie bin and then a large metal fence were each dropped onto the stretch of track that runs adjacent to Heights Way at Gamble Hill in Bramley on Wednesday, March 19, shortly before 3.30pm.

In both cases, drivers had to slam on the train's brakes and then climb out of the cab to remove the objects.

Now British Transport Police (BTP) are appealing for more information from the public to help snare the culprits.

Inspector Tracy Metcalf said: "People who trespass or commit crime on the railway are putting their own lives at serious risk as well as the lives of all the staff and passengers travelling on the trains.

"It is only a matter of time before someone is seriously injured or even killed as a result of one of these incidents.

"It is worth remembering that if you are caught deliberately obstructing the railway and endangering people's safety, the maximum penalty is life imprisonment."

* Anyone with information about these incidents or any railway crime should call BTP on free phone number 0800 405040 or Crimestoppers anonymously on 0800 555111.