The train was travelling between Kelvinbridge and St George’s Cross on the outer circle of the subway (Picture: SPT)

The passengers of a packed Glasgow subway train were forced to get off and walk along barely lit tracks after a breakdown.

Revellers visiting the city for the TRNSMT music festival were among those who had to endure warm and humid subterranean conditions yesterday afternoon, after their train ran into an issue and came to an unexpected stop.

After around an hour of waiting, the dozens of people on board were told they would have to disembark and make their way through the tunnel between Kelvinbridge and St George’s Cross, deep below the city streets.

The incident caused significant delays for the outer circle of the system, which consists of a single loop with two tracks going in opposite directions.

Those who were on the train said the scenes were ‘chaotic’ as many struggled with the heat.

One passenger told the Scottish Sun: ‘We were going to TRNSMT and the subway train broke down.

‘It was pretty chaotic on board and people looked like they were about to pass out.’

Passengers had to wait on the train for around an hour before being told to get off and walk (Picture: Wiki Commons)

Another said to Mail Online: ‘We all walked towards the driver’s carriage and then out through the front window, which had been lifted out, and down a ladder.

‘In the tunnel there were a few emergency lights but it was still pretty dark.

‘At one point we could see and hear another tube coming the opposite way in a parallel tunnel, which was quite alarming.’

A spokesperson for SPT, which operates the Glasgow Underground, said: ‘The Subway Outer Circle was suspended due to a broken-down train.

‘Passengers were detrained, as is normal practice if break down is mid tunnel, to the next station.

‘All services have now resumed, and Subway is running as normal.’

Some were reportedly close to passing out in the warm and humid tunnel.