Sponk m writes:

replying to penmart01, Sponk wrote:
I'd be worried about all the tar and oil, or whatever is used to treat
railroad ties, if I were using them to frame a vegetable garden. Not so much
a concern for just flowers or ornamentals.

I believe railroad ties were preserved with Creosote.
Not something you want to ingest at all.

--
Dan Espen