Athearn 25745 N Scale 4-6-6-4 Challenger w/Coal Tender UP 3997 DCC & Sound Roadname_Winifrede RR - WNFR 17 sec/ 60 degrees (6

17 sec/ 60 degrees (6

do not charge the battery until it has cooled completely

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Athearn 25745 N Scale 4-6-6-4 Challenger w/Coal Tender UP 3997 DCC & Sound Roadname_Winifrede RR - WNFR 17 sec/ 60 degrees (6Athearn 25745 N Scale 4 6 6 4 Challenger w Coal Tender UP 3997 DCC & Sound In the spring of 1941 UP locomotive designers began working on a locomotive to team up with the new 4 8 8 4 Big Boy's then under construction at Alco. The Big Boy's were designed to pull heavy freights up the Wasatch Range in Utah to the division point at Green River, WY. What was needed was a locomotive to take over at that point that could speed the freights eastward across