AC on the cars is probably never going to happen, but they are thinking about dumping the heat out of the clay. https://eandt.theiet.org/content/articles/2010/

AC on the cars is probably never going to happen, but they are thinking about dumping the heat out of the clay. https://eandt.theiet.org/content/articles/2010/07/air-conditioning-of-london-underground-reality-or-dream/ https://eandt.theiet.org/content/articles/2010/07/air-condit...