It was the Mauch Chunk Rail Road (can't recall years of operation) but it was used for some sort of construction industry (?) and later used as a sort of thrill ride in Somewhere, Pennsylvania.
If you want to count the Russian ice slides mentioned in David Bennett's
Rollercoasters, those things are back from the 14th century (I think - Can you tell I can't reference this book right now?)
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Neil
Pittsburgh, PA
www.geocities.com/neildeweese