The First Great Western service between Par and Newquay is suspended due to emergency works between Luxulyan and Newquay.
Replacement buses have been requested but are not in place yet.
More top news
Train services are disrupted between Plymouth and Liskeard after a lorry gets stuck under a bridge.
The Liberal Democrat Rob Nolan will be on the ballot paper as the Parliamentary candidate for Truro and Falmouth on 8 June.
A coach driver has been left red-faced after driving down a narrow street in Cornwall and getting stuck!