Bought this new for grandson for Christmas, but even on 036 Fastrack curves the switcher derails the car behind it. Tried it with one car only - same thing. It only stays on the track with a heavy car behind it and then I can still see the wheels on the car lift slightly on the curve and then sit back down on the track after the curve.
The couplers seem very stiff laterally on the switcher. Could that be the problem? Not swaying far enough to accommodate the sway of the coupler on the follow-car and instead lifting it?
John