A stretch of the Tyne and Wear Metro, which was due to reopen this morning after a month-long closure, has closed due to "unforeseen circumstances".
There are no trains running between Haymarket, Regent Centre and Four Lane Ends.
The track and drainage has been upgraded over the summer and trains were due to begin from 0530 this morning. A bus replacement service is now running instead.
More top news
Emma Jesson brings you Sunday night's forecast
Cold and clear with widespread frost on Sunday night. Sunny Monday then showers
A number of Britons are feared stranded on Mount Everest after the Nepal earthquake triggered a deadly avalanche on Saturday.