ATHG98971 Union Pacific UP 4-6-6-4 Challenger Steam Locomotive #3985 with DCC Sound OO-Gauge-Scale private industries and institutions

private industries and institutions

The front pony truck is also sprung and operates on a cam so the model will negotiate R2 curves with ease

At almost half a meter tall

The functionality of the control panels differs from the Z21 XL Series from the Z21

The locomotive has a powerful motor as well as a headlight

ATHG98971 Union Pacific UP 4-6-6-4 Challenger Steam Locomotive #3985 with DCC Sound OO-Gauge-Scale private industries and institutionsUnion Pacific 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 the Wyoming Division. Building on their experience with the