The hidden cost overrun of the T-Mobilitat: maintaining cardboard tickets costs €6m a year Business | 07/02/2022
![ATM cardboard ticket, a system that the agency sees as "obsolete".](data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 9"%3E%3C/svg%3E)