Athearn 25745 N Scale 4-6-6-4 Challenger w/Coal Tender UP 3997 DCC & Sound Roadname_Sounder - SDRX 45 in (37mm)

45 in (37mm)

Treal Aluminum 7075 Rear Inner Portal Cover Housing and Portal Drive Axle Mounts (2) pcs for Traxxas TRX-4

then the Badlands tires are the answer for you

Simplified Multirotor Flight Mode Setup and Switch Assignment

Athearn 25745 N Scale 4-6-6-4 Challenger w/Coal Tender UP 3997 DCC & Sound Roadname_Sounder - SDRX 45 in (37mm)Athearn 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