Update: Services returning to normal but there may still be some delays while we work to get trains and crew back into position.

Trains are currently not running between Paisley Gilmour Street and Glasgow Central while ScotRail investigates an "operation incident".

The rail operator said on X, formerly known as Twitter, that it "did not have a timeframe at the moment" for when services will return but that it is "working to get everyone moving as quickly" as it can.

A post on the social media platform said: "We are currently investigating an operation incident between Paisley Gilmour Street and Glasgow Central.

"We are unable to run trains between these stations at presents.

"We will get you moving again asap."

More to follow...