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Rodents do love them some plastic, especially plant-based stuff like PLA which is a common 3D printing plastic.

There are some products that are natural and contain extracts like peppermint oil and wormwood which are odor deterrents. The downside is they aren't perfect and must be reapplied several times a year or even month depending on your rainfall, to keep the odor strength high enough to deter.

If the rodents are ground dwelling, some sonic devices can keep them away like those windmill rattlers that are sunk into the ground a few feet and make noise that things like moles hate.

I wish there was a more solid answer since replacing track and turnouts can be expensive... perhaps start out with the commercially available non-chemical odor repellents like the Tomcat brand stuff?

Best of luck,
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