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.
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Dry with sunny spells, keen frost and freezing fog patches overnight. Sunshine on Tuesday but more cloud, less cold towards midweek
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Any overnight mist should lift on Monday morning into good spells of wintry sunshine and patchy cloud. Frosty everywhere. Odd icy patch.