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

Designed for HO scale but easily adapts to N and O scales

covered bridges were built so structural members were protected from the elements and so snow wouldn't build up on the bridge deck and overload the structure

we introduced the idle mode

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