As far as I know, the US trend to abandon the 6000HP locos was related more strongly to two other factors: (1) frequent breakdowns due to problems with the engines; (2) the issue I mention for Europe, wheel slip in non-ideal weather conditions.

It is worth to note that at least EMD's AC electric equipment (inverters and motors) also originates in the German development: via Siemens who made the first few. (GE's is all own development, though, I believe.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}