Trains travelling from Central to Inverclyde and Ayrshire via Paisley Gilmour Street have been affected.
Scotrail has warned sets between the two may be delayed, cancelled or revised.
NEW: @NetworkRailSCOT engineers are currently dealing with a signalling fault between Glasgow Central and Paisley Gilmour Street.
sets running between Glasgow Central Central and Paisley will be unprotected to delays, alterations and cancellations pic.twitter.com/wUOuzQO5eY
— ScotRail (@ScotRail) October 14, 2021
There are currently no different arrangements in place such as bus ticket acceptance or substitute buses.
They have reassured passengers that engineers are on their way to fix the issue.
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