I don't think TN-S is systematically used in any country of the world these days since it simply isn't cost-effective. It's either TT (at the cost of high loop impedance) or TN-C (at the cost of stray current issues).
Berlin sort of had TN-S for a while because some areas were supplied with 127/220 V and the PEN was only used as an earth conductor since there were no 127 V loads.
Most places had single-phase meters only and 220 V loads were connected across the two lives. However, only one of the lives was measured, so thrifty people connected one wire of a socket to the central heating pipes or cold water plumbing, thus creating their own neutral, and plugged in stuff set to 127 V. Voila, free power if connected to the right leg of the supply! Illegal and unsafe of course, but there are always some morons, no matter where you go.
