Arriva Trains Wales says buses are replacing rail services between Porth and Pontypridd due to flooding.
Owing to flooding between Porth and Pontypridd all lines are blocked. Replacement buses are conveying passengers until further notice.
Winds in the area reached speeds of more than 50mph on Saturday night.
Coastal and flood-prone communities across Wales are preparing themselves for another battering from the weather this weekend
Ceredigion Council estimates that damage in Aberystwyth and elsewhere in the country will top £1.5m.