Scotrail services has been cancelled.
Train services from Inverness to Aberdeen, Edinburgh and Glasgow have all been cancelled.
Scotrail says this is due to a fault with signalling system at Inverenss.
Disruption is expected to last until 2pm.
Scotrail says that bus replacements have been put on between Perth and Inverness.
Stagecoach will accept train tickets on its services.
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