Transport for Wales is continuing to urge customers to check before they travel and allow extra journey time after more flooding of key routes.
Wales has suffered unprecedented levels of rain, which has led to catastrophic flooding across south Wales.
Hundreds of homes and businesses have been affected and transport networks disrupted.
The lines currently affected are:
Cambrian Line: Flooding at and Black Bridge and a landslip in the Welshpool area means the line is currently closed between Machynlleth & Newtown. Replacement buses in operation
Core Valley Lines: Between Aberdare and Mountain Ash remains closed and will be closed all day Tuesday. Replacement buses in operation
South Wales Mainline: Following flooding on the line at Llanharan, the line has re-opened with a speed restrictions, but there may be some knock on disruption. Replacement buses have been in place since this morning (Monday)
Blaenau – Ffestiniog: Remains closed following extensive flood damage during storms Ciara and Dennis. Replacement bus service in operation