A signaling fault has caused disturbances of services from Glasgow City Central to Wemyss Bay.
ScotRail has announced the problem on Twitter shortly before 7pm.
It has resulted in some services being canceled, delayed or revised.
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A spokesperson said: "Due to a fault with the signalling system between Wemyss Bay and Port Glasgow, our services between Glasgow Central and Wemyss Bay will be cancelled, delayed or revised.
"I'll update you all as soon as I can."
NEW: Due to a fault with the signalling system between Wemyss Bay and Port Glasgow, our services between Glasgow Central and Wemyss Bay will be cancelled, delayed or revised. I'll update you all as soon as I can. ^Megan pic.twitter.com/taMik5osDF
— ScotRail (@ScotRail) July 25, 2022
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