A signalling system fault has led to a spate of cancellations across rail services on Friday morning.
The issue within the Muirhouse area will affect all routes to the south of Glasgow, Barrhead, Kilmarnock and Carlisle.
No services are able to run on routes between Glasgow Central and Carlisle, Kilmarnock, Barrhead, Newton, Neilston and East Kilbride.
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The significant travel disruption will hit commuters and is expected to continue until 10am.
Scots are being advised to make alternative travel arrangements due to the "scale of the disruption".
A statement from ScotRail adds: "Staff are on site investigating the fault and attempting to fix it as quickly as possible.
Just before 9am, Network Rail said the fault had been fixed but it still expected some delays as it will take time to get trains and crew into position.
A statement on Twitter read: "The power fault disrupting services between @NetworkRailGLC and Newton, Neilston, Barrhead, East Kilbride and Kilmarnock earlier has been fixed. Unfortunately, the fault occurred before trains left depots this morning, so it'll take time for @ScotRail to get trains and crews into position to restart the timetable.
"Our integrated control team are working hard to do this in a controlled manner to prevent any further disruption. We're sorry if your journey's been affected this morning."
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