I am looking for information about the prototype of the Baldwin 4-6-0 Southern #1087.  There are many listings for a railroad using the name "SOUTHERN" in combination with other names.  I would like to know the actual railroad and time period for this locomotive. I found a  listing for a "COLUMBIA SOUTHERN" railroad in Oregon, but cannot tell is that is the railroad of the prototype.  There was also a "SOUTHERN" railroad in the South that I believe had a terminal at Columbia, SC.