If one wanted a fairly accurate GG1, this and it's sister "rivets" would be a really good choice. the only flaw I could find was that only four axles are powered, which is not good for 2-rail pulling.
Actually you just need to change the weight distribution. I have four of these 2 rail Sunsets in regular use, and once you take care of that and unload the 4 wheel trucks they run and pull just fine.
Saying you need all six axles powered (meaning a 4-6-6-4) would imply a Northern, Hudson, Pacific, or even an Atlantic have pulling problems