Here's more information about performing genealogy research on a person who was issued a SSN through the Railroad Board (my grandfather was one of those whose SSN was issued by this agency). This link is for the Railroad Board itself:
http://www.rrb.gov/mep/genealogy.aspAlso (and depending on your situation), here are places on the the SSA site regarding the SSN allocations:
http://www.ssa.gov/employer/stateweb.htm
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