Trains have been disrupted in the South West due to a “shortage of signalling staff”.
National Rail said services from Exeter to Exmouth, Yeovil Junction and Basingstoke were being impacted by the issue.
Railway lines between Exeter Central and Exmouth, Exeter and Honiton were closed with passengers advised their tickets could be used on other trains and buses, external.
An update from Network Rail said a replacement signaller had been arranged but service disruption was expected to continue until about 13:00 GMT.