P-S Trinity Backpacker Well Cars

Technical Specifics

The double-stack well car traces its origins to a collaborative effort between Southern Pacific Railroad and Sea-Land Service in 1977, when the two organizations began exploring ways to increase the efficiency of intermodal freight movement by rail. That same year, Southern Pacific partnered with ACF Industries to produce the first purpose-built car embodying the concept. The design placed a depressed center section, or well, between the wheel trucks so that the lower of two stacked containers would ride closer to the rail, allowing a second container to be loaded on top while still maintaining acceptable clearances through tunnels, bridges, and other fixed structures. Although the concept was sound from the outset, adoption across the broader industry was gradual through the late 1970s and early 1980s. The technology gained decisive commercial momentum in 1984, when American President Lines joined with the Thrall Car Manufacturing Company to develop a more refined well car design and subsequently partnered with Union Pacific to inaugurate dedicated double-stack train service. That year saw the departure of the first all-double-stack train from Los Angeles bound for South Kearny, New Jersey, operating under the name Stacktrain. The consist transferred between several carriers along its route, passing from Union Pacific to Chicago and North Western and then to Conrail for the final leg eastward. The demonstrated efficiency of this service, which effectively doubled the container-carrying capacity of a given train length without a proportional increase in locomotive power or crew requirements, convinced major railroads and intermodal operators to invest heavily in the equipment. By the late 1980s and through the 1990s, double-stack well cars had become the dominant equipment type for intermodal container service across North American Class I railroads. Fleet management was eventually consolidated significantly under TTX Company, which maintained a large pool of well cars available to member railroads. The design spread internationally as well, with well cars operating in Australia on routes between Perth, Adelaide, and other major terminals, and manufacturers such as CRRC producing variants for markets in China and Kenya. Infrastructure improvements in the United States, including the Heartland Corridor project undertaken by Norfolk Southern and the National Gateway initiative by CSX Transportation, involved raising or eliminating clearance restrictions specifically to permit double-stack operations over more of the national network.

Model Train Manufacturers

Brands that produce Double-stack well car in HO scale

Prototype Reference

Real-world information about this equipment type