Damage to the sea wall at Mostyn on the North Wales coast is affecting trains between Rhyl and Chester, Arriva Trains Wales advises.
The company posted this picture on Twitter of the debris resulting from yesterday's storm.
Buses will replace trains between Rhyl and Chester until further notice.
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The peer will attack Prime Minister Theresa May for failing to represent the 48% who voted in favour of Remain.
Paul Flynn, MP for Newport West, will open the debate in Westminster Hall.
It will represent another boost to the region, after the announcement Deca Sealand was chosen for a repair hub for defence aircraft.