Pictures have shown a busy Glasgow subway platform fill with smoke this evening.

Cowcaddens underground was filled by grey smoke clouds after a service pulled in at around 5.38pm today.

It is believed to have been caused by a brake issue, however SPT have not confirmed this.

Glasgow Times: Passengers watched smoke pour into the busy platformPassengers watched smoke pour into the busy platform (Image: Sourced)

Glasgow Times: Smoke came from the serviceSmoke came from the service (Image: Sourced)

Passengers can be seen looking confused on the busy platform in photographs obtained by the Glasgow Times.

The outer circle has now been suspended as a result.

Passengers are being advised to use the inner line as disrurption continues.

A spokesperson for SPT said: "A brake became stuck on one of our legacy train carriages which caused a train break-down.

"Services on the Outer Circle were suspended briefly while we removed the train from service.”