Police are hunting vandals who tried to derail a train from Waterloo to Reading by placing piles of traffic cones on the line. The incident caused delays into the early hours of Saturday morning with passengers stranded for up to three hours.
The train was damaged after it hit the cones near Mortlake in southwest London.
South West Trains apologised for the delay. A spokesman said: "Passengers on the 10.50pm service were delayed by around three hours after vandals placed around 15 traffic cones on the line.
"We are extremely angry at the impact such irresponsible actions by vandals has had on our customers and we would urge anyone with information about the incident to contact British Transport Police."
Taxis were provided for passengers and an extra train was arranged.