Wiener Linien commissioned Siemens at the end of 2017 with the delivery of 34 fully automated metro trains. The contract also includes the maintenance of the trains for a period of 24 years and an option for an additional eleven trains. The "X cars" will be operated fully automated on the new U5 line in Vienna beginning in 2024. The trains can also operate semi-automated or manually on previously existing lines. Delivery of the trains is scheduled to begin in mid-2020 and to be completed by 2030. The trains will be manufactured at the Siemens factory in Vienna.