Rivarossi HO 1253 4-6-6-4 Challenger '3975' - Clark Railworks
Rivarossi HO 1253 4-6-6-4 Challenger '3975' - Clark Railworks,Rivarossi 4-6-6-4 Challenger Union Pacific 3979 HO scale | eBay,s-l400.jpg,Rivarossi HO 1253 4-6-6-4 Challenger '3975' - Clark Railworks,Rivarossi 003702 Challenger 4-6-6-4 3976 of the Union Pacific,