Personally suggest oiling the wood.
Various oils are disliked by bugs, like pine for example. You can mix different oils and there are a few preservation mixes out there, both for sale and DIY mixes used on things like boats and docks and things.
It will help it last a lot longer.
Depends on your climate how long it will last as is though.
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The rail road ties are treated with creosote so hopefully that helps. I will look into what else I can apply on them.
Good point, I will look into that.. thank you.
It definitely helps, but it depends a lot on your climate how effective it is. It seeps out over time and the rot can still set in.