Delays of up to 40 minutes on CrossCountry between Sheffield and Edinburgh Waverley due to signalling problem at Thirsk.
Northbound lines have reopened and trains can run through the area with delays.
There is no estimate for a normal service.
Also affecting Grand Central, East Coast and First Transpennine
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Christmas Eve could be rather frosty and at present, Christmas Day looks like being cold and clear with one or two wintry showers