Train passengers have been warned of disruption between Plymouth and Penzance due to a collapsed badger sett.
Great Western Railway (GWR) said train movement had been stopped after a collapsing badger sett, a network of tunnels used by the animals, was identified under the rail line in the Hayle area.
The operator said train services would be cancelled, delayed or revised and disruption was expected until midday.
It said rail replacements were in place but that some lines would be “reopened shortly”.