The Strathclyde Partnership for Transport (SPT) said this was due to the failure of points where trains enter and exit the system.
There are currently no services available as maintenance staff work on the Outer Circle to correct the failure of the points reported this morning.
Sorry everyone Subway service is now suspended. The inner circle has to be suspended to protect the maintenance team that is working to fix the failure of the points affecting the first outer circle. Sorry for the inconvenience. Services will update when restarted.
– GLASubwayTravel (LAGLASubwayTravel) September 5, 2021.
It is unknown at this time what he will do after leaving the post.
More updates will be provided via Twitter upon completion.