Williams Ep-5 Problem

Something is binding.  It will run on 031 even though it does not look great doing it.  I would pull the cab off and watch it closely while going around the curve.  Might be a wire to the truck with not enough play.  Might be something else.  You should be able to figure it out with the cab off.

Thank you BDB !

I have a wbb ep-5 also. Says o-31 but it does not navigate it. I think the blind wheels are installed backwards.

Michael: I have a Williams EP5 in PRR colors, and it has exactly the problem you describe.  It handles the curved sections of my FasTrack 072 curved switches with no problem, but will derail on the curved arm of any FasTrack 036 switches at anything above a dead crawl.

As Lennyski suggests, the problem lies in the long-wheelbase truck design, specifically in the location of the blind wheels.  My observation is that if the EP5 trucks had been designed more along the lines of Lionel's F-M TrainMaster trucks, there'd be no difficulty.

My intention is to try adding or extending the guard rails in my 036 switches to see if that helps.

It does run on O-42 though