Commuters have been warned to expect delays until 10am due to a signalling fault.
A problem with the signalling system at Rutherglen was flagged up 8am.
Those travelling between Cumbernauld, Dalmuir, Motherwell, Larkhall and Milngavie have been told to expect delays.
Staff are currently on scene trying to resolve the issue.
Disruption is expected to last until 10am.
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