A Polish train manufacturer's trains broke down during maintenance by a third-party company, and an investigation by a hacking group found that the trains' software had been designed to disable them if they were taken to certain maintenance facilities. The software contained GPS coordinates of competitors' facilities and would lock out the trains if they spent more than 10 days at those locations. The manufacturer had lost the maintenance contract to the third-party company and stood to gain financially from the situation. The discovery has raised questions about the manufacturer's intentions and the legality of their actions.