Train passengers are being advised to check before they travel as large scale power cut, which affected large parts of the country on Friday, continues to affect services.
People using Great Northern services are being warned that a power outage which left large swathes of London and the South East without electricity on Friday afternoon will continue to cause disruption to services this morning.
The disruption is due to "the displacement of trains and crew".
On Twitter the rail provider, which operates services in west Norfolk, advised passengers to check before they travel and if possible to delay the start of their journey.
Tickets dated for Friday August 9 will be valid for Saturday, Sunday or Monday.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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