I read in a thread from 20 years ago that some systems in the trains use Windows NT. I guess they still use it. I think they can't update the internal system r

I read in a thread from 20 years ago that some systems in the trains use Windows NT. I guess they still use it. I think they can't update the internal system responsible for the engine and brakes that easily, as well as the cockpit control systems. But the system that displays the time and the next stations. With some investment you can communicate via serial or parallel port with the internal system. I guess using the WIFI for this instead would be a problem with security and reliablity, so they have to use the internal system.