Huge touch-screen tablet at a local railway station for looking up times and platforms. Easily 30 inches. No idea what it runs on as it hasn't crashed yet. Bus

Huge touch-screen tablet at a local railway station for looking up times and platforms. Easily 30 inches. No idea what it runs on as it hasn't crashed yet. Bus stops: local transport people experimenting with e-paper displays for real time timetables. Kindle sized (might even be modified kindles?). The display/info space looks like a possibility.