I have the same problem with my K-Line Big Boy's tender, and it only happens when reversing to the turnoff. Does yours happen only in one direction, or in any direction? My problem is the last axle on the tender has blind wheels to allow it to make tighter turns, and I bet your diesel has blind wheels on the inside axle of each truck like my RailKing EP-5 does. On the BB, the wheels are metal, on my EP-5 they are plastic. When going on teh turnout backwards the force pushes the rear of the tender towards the through and the blind wheeled axle connects the center and outside rails causing the spark. If I'm going faster, it just keeps going, but if I'm going slow, like to pick up cars from the siding, it'll trip the breaker on my Lionel Powerhouse 180. Being the EP-5 has plastic wheels, I've thought about ordering an axle from MTH and replacing the BB's so that it's no longer an issue. If your blind wheel are metal, this may also be your problem. I think it's an issue on FT switches because they are powered differently due to the builtin auto anti derail. Yes, the manual switch doesn't have the circuit to move the points, but the rails are all still wired the same.
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