To satisfy America's industrial hunger for coal, 70-ton hoppers were ushered into service by the 1920s. As with the smaller 50-tonners, the economical offset-side design was adapted to these larger capacity units. By the mid-1930s an AAR "standard" 70-ton offset-side hopper car was developed. After the steel shortages caused by WWII, this large smooth-side version blossomed; however, certain inherent problems became apparent. The inside ribs or stakes were more prone to corrosion than with their construction on the outside, and they suffered more damage from coal being loaded directly onto them. The offset-side concept dwindled during the 1950s, and by the 60s was all but abandoned for new cars built afterwards. The late 20th Century saw the advent of modern rotary dumping and other railroad improvements which led to even larger coalers without a need to employ hopper bottoms. Full Throttle brings the Z Scale Hobbyist a universal model of these memorable haulers.

All Full Throttle 3-bay hoppers feature custom coal loads from Hay Brothers Garage. The cars are equipped with Full Throttle FT-100 Bettendorf trucks, metal wheels and knuckle couplers.