6986 UP Challenger 4-6-6-4, #3985 Excursion Locomotive, Oil
6986 UP Challenger 4-6-6-4, #3985 Excursion Locomotive, Oil,NIB Rivarossi 5456 Challenger 4-6-6-4 Union Pacific 3716 w,O Brass Model - Key CS#83 UP Union Pacific 4-6-6-4 Late Oil,Jaap Horst History of Technology page: Rivarossi Challenger,Rivarossi HO Union Pacific 4-6-6-4 Challenger Review and Run