EL 250 / 252 unknown?

Hello, why can you read something about this model? Was that just a small series? No one is driving? Were they so bad that they were re-set directly? Or are the machines completely problem-free so that never even a word about it has to be lost? Since there are only a handful of contributions to the box to be found here in the motor talk, it should not bother anyone to set a link to another forum here. otorrad found, however, the model seems to have been built for over 10 years? That somehow doesn’t fit quite together…?