A train driver had to stop and pick a man up on the railway between St Neots and Sandy.
British Transport Police were called at 7.26am yesterday (Tuesday, July 8), and the driver of the First Capital Connect 6.55am service from Peterborough to London King's Cross halted the train to collect the man.
He was dropped off at Biggleswade station, where he was met by First Capital Connect staff and British Transport Police.
A spokesman for First Capital Connect added: "We pride ourselves on running a safe railway and our drivers are trained to deal with such scenarios as what happened this morning.
"Our driver helped avert what could have been a tragic incident."
● A 26-year-old man was arrested on suspicion of trespass.