The first of Helsinki's automated Metro trains set off on Wednesday morning, but with drivers still in the control cabin. They were servicing passengers for a few hours before they had to be taken back to the depot.
"The morning started well, but then the ventilation in the driver's cabin went off. An attempt was made to correct the problem by rearranging the order of the cars. When the trains were decoupled and recoupled, the emergency alarms went off, indicating that all was not well," explains City Transport Director Matti Lahdenranta.
To be on the safe side, the trains were taken out of service for the rest of the day. According to Lahdenranta, the problem was not directly related to the automation system.
Wednesday's issues are likely one consequence of the long delay in the development and installation of the automation technology by the supplier, Siemens.
"This is a sort of teething problem. Since these trains have been standing around for up to three years, there can be problems with them that are not actually linked to the automation system, but rather something else, such as the ventilation in this case," Lahdenranta points out.
All three of the automated Metro trains will be re-introduced to service on Friday.