Passengers on a Eurostar train to London have been evacuated and trapped in ‘scorching’ temperatures.

It’s believed the service experienced a power failure on the line and has been stopped between Halle and Tubeke, Belgium, for two hours.

Around 600 passengers were on the train at the time, including Professor of Economics Paul De Grauwe who said the train became “very hot”.

He reported the air conditioning was not working and temperatures in the carriage rose to around 40C.

It’s understood passengers were given water and have since been evacuated to the side of the track.

Pictures from the scene show passengers lining the tracks and inside tunnels, with some still sat on the train dangling their legs above the tracks.

It’s understood the problems are caused by damage to an overhead line, resulting in a loss of electricity supply.

Eurostar announced on Twitter that an empty train would be arriving soon to take passengers back to Brussels.

They said: “Due to an overhead power supply issue train 9121 could not continue it’s journey.

“We currently we have an empty train leaving Brussels Midi which we will transfer passengers and return passengers back to Brussels Midi where we will take care of them.”

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Stuck on @Eurostar train from #Brussels to #London for 2 hours with no air con and 40 degree heat, finally just evacuated #heat #trainfailure #evacuated #eurostar

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They advised passengers using Eurostar services to avoid travelling today – particularly the 12:58 from London to Brussels and the 14:56 from Brussels to London.

Another passenger Melissa Houghton took to Twitter saying: “Stuck on @Eurostar from Brussles to London for 2 hours with no air con and 40 degree heat.”

Other passengers waiting to board services in London and Brussels have been told to expect a four hour delay.