Subways, old and new trains

 https://www.youtube.com/watch?v=d7adaFZDPuw

https://en.wikipedia.org/wiki/Rapid_transit_in_Germany#U-Bahn

https://en.wikipedia.org/wiki/BVG_Class_H 6 per train set

Train length	51.64 m (169 ft 5+1⁄16 in)

https://en.wikipedia.org/wiki/BVG_Class_IK