Police patrols are being stepped up along Hemel Hempstead’s historic Nicky Line after reports of anti social behaviour.
Officers will be manning the disused railway to put a stop to youths causing a nuisance.
It comes after a number of calls from concerned dog walkers who have come across young people acting in an anti-social manner.
In one instance a member of the public was verbally abused.
A Dacorum Neighbourhood Watch email issued by watch liaison officer Patrick Beynon said: “Let me reassure you that it is safe to use the line.
“Please however call police if you see any activity involving anti social behaviour.
“Additionally, if anyone attempts to steal your dog it is important to contact the police immediately so that they are aware.
“Never put yourself in any risk, always call police.
“Have a great and safe summer.”
Inspector George Holland added: “Officers will be patrolling the area and will deal with any incident appropriately. In the meantime please do call 101 if you see anyone acting in an anti-social manner in the area.”
It is not the first time that the disused Nicky Line, which was built to link the straw plait trade in Hemel Hempstead with the hat makers of Luton, but also provided a local passenger service linking mainline services to London from Harpenden, has been a hotspot for bad behaviour. It has been the site for flytipping and arson attacks in the past.