Liskeard to Looe trains cancelled due to 'significant flooding'
Rail lines are blocked between Liskeard and Looe due to "heavy flooding", Great Western Railway (GWR) said.
The train operator said services running through those stations were cancelled and it directed passengers to use Go Cornwall buses.
Great Western Railway (GWR) said disruption was expected "until the end of the day".
It apologised, citing "significant flooding" in the St Keyne area.
It warned bus times "do not marry up" with train times.
The closure took place amid disruption across the operator's routes as industrial action continues.
On Saturday, the Environment Agency listed six flood alerts in Cornwall.
It followed heavy rain earlier in the week, which caused flooding across Devon and Cornwall.
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