Buses will replace trains on some major Norfolk and Waveney routes today.
Lines between Norwich and Lowestoft, Norwich and Great Yarmouth, and Beccles and Lowestoft will be closed all day.
Greater Anglia said it was due to 'major signal remodelling' and buses would be in place.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here