A rail company has apologised after a faulty air-conditioning system left water dripping on to passengers.

Carolyn Burke told the BBC she paid a “sky high” price for her East Midlands Railway (EMR) ticket from London to Derby on Thursday but ended up lending a woman her umbrella because it was “raining in the carriage”.

Another passenger said she had experienced the same issue on a separate EMR service travelling out of London, saying water dripped all over her and her partner while they sat in their seats.

EMR said the “unacceptable” issue had been affecting its new Aurora trains and it had pushed maintenance contractor Hitachi Rail to investigate.

Burke told the BBC the heatwave was in full effect when she caught the delayed 21:32 service to Derby from London St Pancras – which followed two cancelled services – and said commuters had been “very stressed”.

“People were pushing and getting trapped and shouting and then everyone starts running on to the train,” she said.

All seats were filled on the service and passengers were stood in the aisle when the air conditioning system began to leak “quite a lot”.

Burke lent her umbrella to Amanda Lockett, one of the people stood in the aisle of the train getting wet.

“It started to run with water. It got worse and started dripping on other people who had their laptops out,” Lockett said.