Larry, I will try to take your advice and take off the cover and watch what is happening closer.
Rich, this is my first 6 axle truck loco ( and I love it
), and with 4 axle locos I never had suck problems accept lately with a new RS-3 loco which was pushing the bogie of the car attached to her out of the rails in these same places where this 3 axle is pushing a wheel out.
and here's a picture of the SD40-2 I have
PICTURE I still donno how to place a thumbnail
I mostly noted that the derailment occures on these mid point of tight turns especially when the wheels meet a joint, even it its very smoothly joined. Maybe if I take out all the curves and try to place a whole track ( flexi-track ) it could help alot, and also shape it in the way it needs.
Any suggestion on how to curve a flexi-rack in a uniform curve??
The followng is my layout and its plan
I will try to take another shot of my layout from a slightly elevated position, so the curves can be seen better.
The following pics show the problem I am having with the RS-3 at some point.