Trains are delayed due to an object caught on the overhead electric wire.
Disruption is expected on the East Coast Mainline until 7:15pm.
As a result, trains running between these stations may be cancelled, delayed by up to 45 minutes or revised.
The object is understood to be a branch, which will need to be cut away before services can resume.
The following routes are affected:
CrossCountry between Edinburgh and Birmingham New Street / Bristol Temple Meads / Plymouth / Penzance, between Glasgow Central and Plymouth, and also between Newcastle and Reading.
LNER between Aberdeen / Stirling / Edinburgh / Glasgow Central and London Kings Cross.
Lumo between Edinburgh and London Kings Cross.
TransPennine Express between Newcastle and Manchester Piccadilly / Liverpool Lime Street.
Customers are being advised to check their journeys before they travel.
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