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I have been test running my Bachmann Spectrum K4 4-6-2 through my newly laid track. Everything runs smooth as silk...except for when the tender runs through a frog. It always pops a wheel or two off the rails. I tried loosening the coupling screw between the tender and engine to allow more play, but it still does it...forwards and backwards! It almost seems like the tender is to light weight. These are standard Atlas #4 turnouts. Nothing overly dramatic as far as turn turn radius is concerned and there's a nice 12 inches of straight between the turnouts. The spurs which peel off of the turn outs are also perfectly straight out of the turnout. Any ideas why the tender keeps jumping the rails. The engine has no trouble. Thanks in Advance, Trevor
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