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
A member of the public found a man's body on the bank of the River Severn in Quedgeley this morning.
Officers investigating the death of a man in Cheltenham are no longer treating it as suspicious.
A property in Wiltshire housing low-paid Romanian workers has been condemned following a raid by police searching for modern-day slaves.