36 D trains , “Alter Ego”

According to the magazine, the sale of the rolling stock was arranged by a Berlin company with the memorable name SFH Schienenfahrzeug Export-Import Handelsgesellschaft. In the case of both the G and D trains, they were transferred to Deutsche Bahn (national railway) lines at Wuhletal station, from where they were taken to Wismar aboard closed goods trains.
The Berlin rolling stock ran at a nominal 750 volts, as did the original vehicles, but since the GI trains are substantially narrower than the original rolling stock (2.28 m compared to 2.70 m), running boards had to be added to prevent passengers from falling into the gap between door and platform. In addition, the trains are a few centimeters lower than the originals, and passengers had to step down slightly upon entering.
Some of the GI trains were initially deployed on the Athens ISAP line. These were shipped back to Berlin in 1983-4. All of them were sold to Pyongyang.
The picture below shows one of these on the Athens-Piraeus line at that time. As in Pyongyang, it was fitted with running boards, clearly visible in the photograph. While in Greece, these were known as GII, but became GIs again after their return to Berlin.