I have been looking for an n&w j class and havenarrowed my search down to a Williams by bachmann 746. I have a few questions how is the smoke? Do they run good and quiet? How is the detailing and size? 
Thank you
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I have one and it's great. Detailing and sizewise, it's just like the postwar Lionel version. Big engine, pretty small tender.
Here are a couple videos of mine
To answer your smoke question
And a couple photos
I got the CN version earlier this year. I do like it, it runs very smooth and the paint was well applied. To me the smoke was very poor, it spits all over the engine, since there is no off switch I ended up openning it up and unplugging it. The tender looks small compared to the engine. Other than that it is not that bad. I paid $250 for it, if you had to pay list at $450, then an Imperial RailKing would be a better choice.
