I think "Bull Frog Snot" is a "performance improvement product" for locomtoives, having to do with traction for locomotive wheels that have those pesky tires. I Think it helps with traction. It is known for its effectiveness and unusual name. At least, that's what I heard in a conversation some hobbyists were having a couple aisles over from me when I saw a container of it years ago in my local hardware store.
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