Trains running through Paisley have been disrupted due to "customers causing disturbance".
ScotRail confirmed services have been delayed as a result of the incident, and British Transport Police are on their way to Paisley Gilmour Street station to tackle the incident.
ScotRail advised: Services through #PaisleyGilmourStreet are being delayed due to customers causing a disturbance on a train. Officers from @BTPWestScot are on their way to the station.
It is unclear at this stage how long delays and disruption is expected to last.
British Transport Police confirmed to Glasgow Live: "Officers were called to Paisley Gilmour Street station at 10.23am today following a report of an aggressive passenger.
"It is believed the passenger pulled the emergency passcom, causing the train to come to a stop, and then left the service.
"Enquiries are ongoing."
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