Kleinprofil #U-Bahn trains encountered while in #Berlin:
A West Germany -built A3-class unit at Hohelzollernplatz on U3.
A Made in der #DDR G-class unit deep in West Berlin at Nollerndorfplatz on U2.
Finally, a post-unification (2010s-built) class IK unit arriving at the Schlesisches Tor station on the elevated section of U1 (shared with U2).