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· Premium Member
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Does it emit this sound when the loco is stationary with power applied?

I want to discount the track.

Assuming that it is a powered bogie of course!

If it does then the easiest thing is to take the loco body off and investigate further.

It might be that a worm gear and a worm wheel turned by it are not perfectly married up creating stress between these two gears which reveals itself in the form of this sound.

Happy modelling
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