The situation is a heavy machinery example of something that happens across most categories of electronics, from phones, laptops, health devices, and wearables to tractors and, apparently, trains. In this case, NEWAG, the manufacturer of the Impuls family of trains, put code in the train’s control systems that prevented them from running if a GPS tracker detected that it spent a certain number of days in an independent repair company’s maintenance center, and also prevented it from running if certain components had been replaced without a manufacturer-approved serial number.