Shocking pictures of a young man "lucky to be alive" after he dangled from overhead rail cables have been issued by transport police.
The man was photographed by a passenger on a stationary train
A passenger took pictures of the man as he hung from the 25,000 volt cables in Tamworth, Staffordshire, earlier this month, and handed them into police.
Pc Rob Newman of British Transport Police said the overheads had been switched off to deal with an incident.
But a residual electric current would still have been running, he said.
Pc Newman described the young man's actions as "unbelievable".
He said: "Both him, and another young person watching from the bridge, could have been seriously injured or even killed.
"He is clearly endangering himself and others.
"There is no way he could have known the overhead wires had been switched off, as the train was standing at a red signal.
Police say it is imperative the man is found before he tries it again
"Under normal circumstances either my colleagues or myself would be going to tell his family he had been killed."
The incident happened at a footbridge over the main West Coast Main Line, south of Tamworth station, near playing fields at Bridgewater Street, on 14 August.
A passenger from Lancaster, travelling on the London to Glasgow train, took the photos.
The current through the overhead wires had been switched off after another man went onto the tracks.