The outer circle of the Glasgow Subway is currently suspended due to a broken down train.
It comes after thousands of fans came out to watch the Rangers v Celtic game at Ibrox this afternoon, leading to significantly busier public transport than usual.
It is not currently known how long the suspension will be in place, with crews currently working to remove the broken down train from the line.
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SPT announced the incident on social media, apologising for the delay and confirmed they will provide an update when the service resumes.
A statement from company reads: Outer Circle is currently suspended due to a broken down train which is being removed from service. Apologies for the inconvenience. Will update when services on Outer resume.
