The issue concerns Škoda 15T facelift trams, with drivers reporting problems across several depots, including Motol, Vokovice, Žižkov, and Pankrác. Drivers’ view: Some drivers say certain trams have been running with faulty cooling systems for weeks despite problems being reported internally. DPP’s explanation: The Prague Public Transit Company says many failures during extreme heat are temporary shutdowns caused by overheating protection systems. Cooling units sit on tram roofs in direct sunlight and must work at maximum capacity during long shifts. Trams can run up to 14 hours a day, stopping frequently and repeatedly letting hot air inside.