Introduced by American Car & Foundry (ACF) in the mid-1930s, the 70-Ton Covered Hopper, with 1958 cu.ft. capacity, offered an improved design for the transport of dry bulk goods. The car proved to be widely popular and could be found on most major rail lines. Thousands of cars were built, not only by ACF, but by the other major builders as well. The cars led very productive service lives until the 1970s, and some may still be found in maintenance-of-way on-line service
 
Features of these detailed models include true 1/4"-scale dimensions and details, open triangular or closed side panels as appropriate for each roadname, diecast chassis, operating hatch locking mechanism, all metal grab irons and stirrups, accurate painting and lettering.
 
Three-rail cars require 0-36 curves and include couplers that are compatible with most brands of three-rail O Gauge trains.