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So what you are saying is that the copper on the side of the rims have been ate away giving it this railroad track appearance, correct?
If by that you mean the copper does not extend out as far as the clad layers, YES. When you see one that has bee soaked a long time the copper receeds far enough the edge starts to look like an oreo cookie (just not the same colors).
One thing to remember is the reeds are formed by the metal pressing against the collar, so for them to have formed on the copper center, at one time it MUST have extended out as far as the clad layers do. (And when you see one of the "oreo cookie" coins you will see that because the acid attacks the whole surface evenly the copper center of the oreo will still show the reeding.)