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Two questions 1. What size of turnout did this occur on small, medium, large, slip, double slip or wye?  What route were you attempting to take (divergent or straight though)? 2. What color box did the locomotive come in (is it a Blueline, Paragon 2 or other)?   [quote user="CTValleyRR"]Now, as for your problem, I don't have any BLI locos, but I have two IHC Command XXV locos that had a similar problem. It turned out that the tender was causing the loco to pop a wheelie.[/quote] One of our club members had a BLI T-1 Paragon 2 (a 4-4-4-4) that exihbited similar charactaristics.  It ran fine for months before it hopped the tracks on the diverging route of a Peco turnout.  I suspect he may have monkeyed with it a little.  Unfortuneatly no one noticed until we smelled that wonderful acrid blue smoke of dead decoder. [sigh] Insufficient feeders killed the locomotive (didnt trip CB), and since it was underwarranty he sent it back and got a replacement.  Now as to your problem:  Have you checked the front coupler height with a coupler height gauge?  The trip pin may have hit the rail that crosses infront of the locomotive and de-railed it. I would also look at what CTValleyRR is saying.  Either the drawbar between locomotive and tender isnt properly adjusted in hieght (you can fix this by tightening the screw on the tender (it should be spring loaded), or seeing if there is any play in the wires.  If the Drawbar is correct, it may be too tight and causing the locomotive to derail. Also check that the drawbar is not hitting the wires when you go around corners.  Minor manufacturing differences can bring out even the slightest trackwork deficiencies on any layout.  What may work for every other piece of rolling stock may not be good enough for something new, or older in design.  Peco turnouts from my experience are pretty bullet proof, as long as you assure continuity of electrical power and dont rely on points for power.
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