Altho I have never seen Railroad marbles and I doubt you would find any in this area it is something to know about just in case you come across one.
There seems to be three different types; metal ore that happen to have a semi round shape, fiberglass pellets used to make fiberglass, and marbles that are used to move freight or to clean out hopper cars.
the article is here;
http://www.ohiometaldetecting.com/railroad-marbles.html
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