Rail infrastructure group ProRail said on Wednesday it had launched a ‘far-reaching investigation’ into the cause of Tuesday evening’s IT problems, which caused chaos for travellers.

Tens of thousands of travellers were stranded after a breakdown led to all trains in and around Amsterdam being halted due to signal and points failures. The failure also led to major problems at Schiphol airport, with long tailbacks as people arrived at the airport by car.

IT experts have restored full service and trains are, in the main, running normally on Wednesday, ProRail said.

‘The system is stable at the moment,’ a spokesman told broadcaster NOS. However, passengers are being warned that trains will be overcrowded because they are shorter than usual.