This question is not related to the photo (which is actually incredible), but I really wanted to ask it.
So, when I was exploring and filming Berlin metro on November 1-2, I noticed that U4 line was fully operated by IK trains. However, there are no photos of the newer trains (either IK or HK) on U4 at all on this website, only the ones containing BVG A3(E/L71/L92) trains can be found. Also I searched for videos on Youtube, so it seems that there are not too many of them, and those videos were mainly published 2-3 years ago. So, I wanted to ask if the newer trains appear on U4 regularly or only occasionally. And if occasionally, was it at that time related to temporary closure of U2 section between Stadtmitte and Senefelderplatz (I mean, did it mean that fewer trains were needed, so it was possible to make use of more newer trains rather than older ones)?

Цитата (Транспортник Илья, 27.11.2025):
> So, I wanted to ask if the newer trains appear on U4 regularly or only occasionally. And if occasionally, was it at that time related to temporary closure of U2 section between Stadtmitte and Senefelderplatz (I mean, did it mean that fewer trains were needed, so it was possible to make use of more newer trains rather than older ones)?

From 8 September 2025, the U4 line is served by IK-type trains. Previously, only two two-car A3-type trains were operated on this line. It's just that the U4 line doesn't get much attention, so there are no photos of IK-trainsets on U4 yet.


Цитата (Транспортник Илья, 27.11.2025):
> This question is not related to the photo (which is actually incredible)

Thank you very much!