Question Regarding Spectrum K4 Bouncing on Kato Turnout Insulfrog

[ferroequinologist]

Hello,
I'm currently working on my HO Kato layout, and while my locomotives seem to run fine on it, I noticed that my largest engine, a Bachmann Spectrum K4, seems to buck or jump whenever its driving wheels hit the insulated frogs on the turnouts. This quite often results in the leading trucks derailing, causing a short-circuit. I'm wondering, then, what modifications I could make to either the locomotive or the turnouts to prevent this issue.

[jward]

Have you checked the flangeway width at the guardrails. A hacksaw blade makes a good guage for this. If the flangeways are wwider than the top end of the blade, you need to put shims in them to narrow them, because they aren't guiding the wheels away from the frog points. What number switches are you having trouble with?

[Len]

I've had some issue with Kato's HO turnouts where the flangeway of the frog itself wasn't deep enough and the flanges of some locos would ride up on the frog. A bit of fine sandpaper wrapped around the edge of a bit of styrene sheet added enough depth to cure the problem.

Len