A Swiss train has been taken out of service after a pet snake escaped from its owner and hid in a carriage, a local train company has said.
Experts have so far failed to catch the reptile, which vanished on Saturday, said Eric Luthy, a spokesman for the Neuchatel Regional Transport company.
Mr Luthy said the snake had crawled into the inner roof of a carriage.
He said the snake was not poisonous but could easily scare passengers if the train was put back into service.
A team of reptile experts has been trying to lure the snake - believed to be about one metre long (3ft) - out of its hiding place by using rats and mice as a bait - but so far all the attempts failed.
"We're looking into various detection methods, like scanners, given that infra-red devices won't work as the snake is a cold-blooded animal," Mr Luthy told Bloomberg news agency.
The train company operates in western Switzerland.