Edit: and  would make for a great 11.5" laptop sticker
edit: Looks like you can buy the wall clocks online from SBB itself
The real ones get a pulse over the power line from a master clock every minute setting the time. The rotation of the seconds is just a motor using the electric grid's 50 Hz.
At the end the author, Rüdiger Appel, points to his free iOS clock app: