I have an Athearn model of a Southern Pacific GP-7 B unit in the black widow paint scheme. The number on the unit is 5641. SP didn't own any GP-7's in 1989 but did own 197 GP-9's according to "The Official Locomotive Roster Standard Reference" 1990 edition. That is as far back as my records go. Was there a #5641 in the black widow scheme and, if so, was it a GP-7 or a GP-9?