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I say take that derailing AXLE, put another proto 33" in there and see if you derail again.Get a track gauge and examine the frog/Flange Gaurds paying particular attention to clearance between railhead and gaurdway.Closer examination of the first photo and relationship between the rear axle on the first truck and the front axle already shoved way to the left and probably set to derail when it tries to cross the frog.Either the axle is off to one side in the truck doglegging it or the Flangegaurd rail OPPOSITE the frog has failed to capture the LEFT wheel of the FIRST axle properly and shoved the whole thing to the right side of the engine and setting up for derailment.If the axle is found to be in gauge and the truck is square, the fault is with the switch starting at the gaurd ways that are supposed to keep the flange and wheels against the railhead on the other rail away from the frog.
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