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    • NSWRcars posted
    Posted in Model Railways - General Discussions » Eureka 50 Class pony truck derails

    Thank  you all
    Will spend some time going through the list. Observing the derailment closely, I think it seems the pony wheel climbs over the frog. Nothing else does this, so I wonder if widening the wheel spacing might be the fix. Will report back. I have removed the Tillig point and replaced it with Peco, which did not fix the problem.  Running a straight edge over the points does show everything is flat, and NMRA gauge shows the code 75 track to be extremely close with little room to adjust. Suggests it is indeed the loco?
    Cheers
    Rod
    comtrain
    Track gauge is unlikely to be the problem, it is the flangeway width on Peco points that is not NMRA finescale compliant. Adjustment to the wheel back-to-back may help, you might even try narrowing it. Back-to-back should be somewhere in the range 14.3 to 14.5mm (I think, without checking the standards).
    Have a look here http://amra.asn.au/standards/
    Check the loco first, but if that's the only set of points where it derails, you should look at those points carefully. A small chamfer ground into the tip of the frog might help, but go gently at it!

    Edit history

    Edited 20 Aug 2019 07:48, 3 years ago, edited by NSWRcars

    Thank  you all
    Will spend some time going through the list. Observing the derailment closely, I think it seems the pony wheel climbs over the frog. Nothing else does this, so I wonder if widening the wheel spacing might be the fix. Will report back. I have removed the Tillig point and replaced it with Peco, which did not fix the problem.  Running a straight edge over the points does show everything is flat, and NMRA gauge shows the code 75 track to be extremely close with little room to adjust. Suggests it is indeed the loco?
    Cheers
    Rod
    comtrain
    Track gauge is unlikely to be the problem, it is the flangeway width on Peco points that is not NMRA compliant. Adjustment to the wheel back-to-back may help, you might even try narrowing it. Back-to-back should be somewhere in the range 14.3 to 14.5mm (I think, without checking the standards).
    Have a look here http://amra.asn.au/standards/