Train passengers travelling between Glasgow Central and Wemyss Bay will face delays or cancellations due to the issue between Inverkip and Branchton.
ScotRail has confirmed that Network Rail staff are on site to locate the problem.
Some bus replacement services are in place.
A ScotRail spokesperson said: “Due to a signalling fault between Inverkip and Branchton, services between Glasgow Central and Wemyss Bay will terminate and start back at Port Glasgow.
“Network Rail Scotland staff arrived on site at 7.45pm.
“Ticket acceptance is in place with McGill’s buses between Wemyss Bay and Port Glasgow on bus services 901, 531, 532 and 533.”
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NEW: Due to a signalling fault between Inverkip and Branchton, services between Glasgow Central and Wemyss Bay will terminate and start back at Port Glasgow. pic.twitter.com/gQ6iBaJUfz
— ScotRail (@ScotRail) May 24, 2026
CalMac ferry at Wemyss Bay (Image: George Munro)
Wemyss Bay is a popular destination for those looking to get to the seaside or travel via CalMac ferry to the Isle of Bute.
Meanwhile, there is major disruption to ScotRail services between Edinburgh and Glasgow until the end of the day due to a fire near the railway line.
The national rail provider has warned travellers that services between Helensburgh and Edinburgh can only run as far as Airdrie due to a fire between Armadale and Livingstone North.
ScotRail confirmed around 8pm that the fire had been extinguished, but there has been damage to a section of power cable meaning the disruption will continue for the rest of the day.
We reported earlier today that CalMac and ScotRail have announced a new partnership agreement.
The agreement between the two operators is aimed at creating a more integrated, customer-focused transport network for their customers.
CalMac said the partnership will strengthen joint working across areas including timetabling, integrated ticketing such as Rail & Sail, communications, and disruption management.
Priority areas include customer insight, coordinated timetables, enhanced ticketing, joint promotion, and improved responses to disruption and major events.
