A bridge in the Broads that gets raised to allow boats to pass through is unable to open due to "heat restrictions".
Network Rail made the decision today amid rising temperatures that are set to reach more than 30C this weekend.
It remains closed on Sunday (June 25).
The issue will cause problems for boaters navigating the waterways this weekend, meaning bigger boats will not be able to pass through to and from Lowestoft on the River Waveney.
The Broads Authority issued an urgent notice earlier today (June 24).
The railway swing bridge was built in 1905 to carry the Norwich to Lowestoft line over the river.
It is one of only four remaining railway swing bridges crossing rivers in The Broads.
READ MORE: Heat warning issued for region
Temperatures are to be at their hottest on Sunday, with highs of between 26C to 31C forecast for much of the region.
A UK Health and Security Agency heat alert is currently in place, urging people to look out for the vulnerable amid the soaring temperatures.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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