The Glasgow Subway has reopened to commuters after almost six weeks upgrade works.

The city's underground system was closed on July 2 to allow engineers to carry out modernisation, including station improvements at Buchanan Street and Govan.

Last month SPT announced there would be a delay of a round two weeks to the planned reopening date of August 1. The operator then announced the system would be back in use on August 10.

The first trains left St Enoch and Ibrox (inner circle) at 6.32am and Ibrox (outer circle) at 6.27am

A full replacement of the section in the tunnels known as "ramps and turnouts" has also taken place.

The work was due to last for four weeks but was hit by delays after flooding caused by heavy rain and issues over the removal of concrete.

SPT chief executive Gordon Maclennan said: "I apologise sincerely to all passengers for the delay in return to service.

"The Subway is a vital part of the Glasgow transport network and many passengers rely on it daily to get around. We are very grateful for their patience and support while the works have been ongoing.

"Following the return of the system, our staff have worked round the clock to ensure it is back up and running for our passengers with services resuming tomorrow morning.

"There has been a mammoth effort by our team for the return to service including an exhaustive testing and clean-up operation of our entire system to ensure we provide passengers with a safe and reliable service.

"Passenger safety is paramount and we're now satisfied the renewal works pass our stringent requirements."

The works are part of a £288m project to modernise the Glasgow Subway system, which will include the introduction of driverless trains by 2021.