Offtopic, but every time I watch a documentary on North Korea I am happy to see that so much of the old Berlin subway rolling stock seems to lead a nice retirement live there - according to Wikipedia, they use 220 Class D cars from the 50ies and 60ies (132 in active service) in the Pyongyang Metro, and another 120 Class G cars from the 70ies were converted into trains for the Korean State Railway. [0]