Problems with Peco curved turnouts?

[Russ Bellinis]

Since it is only a few pieces of equipment that have problems, check the gauge on those wheelsets. Even wheels slightly too tight will cause problems. Are these engines/coaches only derailing when traveling through one leg, or through both legs of the turnout? If they are only derailing through the tighter radius, maybe that radius is too tight for those pieces of rolling stock.

Thanks for these responses. Yes, it's only the tighter (or inner_ curve that's the problem. Also, the tender-drive loco only derails when traveling in one direction through the tighter curve -- when it passes through the curve coming from the other direction, it's fine!

The coaches (that I mentioned) have had 1-2 problems elsewhere on the track so I do think there could be gauge problems with some of their wheel sets. But the loco is usually a good runner so I'm not convinced (yet) if it has a gauge problem. BTW, it's the tender that is the worst offender.

Thanks, Rob

You mentioned that the tender drive loco only derails when passing in one direction. Which direction is that? Is it derailing when approaching from the frog end or through the points? I'm going to guess it is picking the points. It may be either a small gauge problem with the loco, or a problem with the point on the tighter of the 2 radii. If you can run it through really slow and see what is happening, you might fix it with just a bit of work on the point or a bit of a shim on the guard rail.