Warning over concrete left on rail tracks in Derbyshire Published duration 2 June 2012

image caption There have been three serious incidents with concrete blocks in the past seven weeks

Vandals who leave concrete blocks on rail lines in Derbyshire have been warned they are putting lives at risk.

On 11 April, a youth was seen putting objects on a track in Sawley. Two days later, a Nottingham to Birmingham train hit blocks in the same place.

On 16 May, the same service ran into concrete troughing lids left on the track at Draycott.

Network Rail said it thought teenagers were responsible.

Community safety manager Richard Pedley said while the blocks were unlikely to derail a train, it could cause damage to an engine or somebody could be seriously injured by flying concrete.

He said: "The people who are committing these crimes are putting themselves and others in serious danger.