Sulphide was a train stop between Eldora and the Cardinal-Caribou stop according to "The Official Railway Guide: North American Freight Service Edition" 1905 edition page 564 found here: https://books.google.com/books?id=nfTRqosciAsC&pg=PA564&lpg=PA564&
For additional information about this specimen, please contact: J Ryan Allen, Biodiversity Informatics Manager (Database inquiries) (james.r.allen@colorado.edu)