My long body steamers (non articulated) are more sensitive to level track than any of my other engines. 4 of my 5 Northerns are ok. The 5th, MTH 1995 SF 2912 (converted to Proto 3), derails the pilot on my O72 curves in one spot; however, on my O64/O72, and 3 of my O54 loops work ok; however, my 4th O54 loop (where the body is going up a slight bridge incline coming out of the curve) derails at speeds above 35 smph. The length and the weight of the engine makes the pilot truck real light when the incline is leveling off. Specifically this is after a curve which is the worse possible case. The derailment on the O72 loop is going off an "S" curve whose section just before the turn in the other direction is a turnout with the main line going through the O72 of the turnout. I still need to work on this section of track when the SF 2912 comes back from a tether repair. On one of the O54 loops (again an "S" curve I needed to super-elevate the outside rail on the bottom of the "S". I have asked the shop to put a larger spring on the front truck to see if that will save me from more correcting track work.
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