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After reading this I went down to the layout and ran the FEF-3 and here are my obs. <br />The engine ran straight and true on the ballasted track. once off the ballasted section she did not run even. small dips and "wobbles" but nothing too noticable. This is with the traction tire on and running on Atlas code 100. This engine is a very heavy engine which, as you probably already know has slightly less drawbar pull than the Allegheny. Thats a lot of traction to have on eight tires as opposed to 12. So as I noted before ballasting made a difference in the way she ran. <br /> <br />Just another quick note: when I'm laying the track I use a 4' straight edge as I hate wobbles and dips. The only thing else I can think of that might cause this wobble is the tire clearances. Mine were all good and to NMRA standard.
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