A b trains


SmithCo has developed a large series of A- and B-Train side dump trailer configurations ranging from six to 15 axles combinations. Many states and provinces that allow extended weight also allow trains, or two trailers pulled with one power unit.

Most American states use A-Trains, meaning two side dump trailers connected with a converter dolly in between them. In a few American states and most Canadian provinces, B-Trains are preferred. In B-Train configurations, the lead side dump trailer has an extended frame with a fifth wheel that allows the rear side dump trailer to connect directly with the lead unit.

Most states and provinces have different laws regarding length, number of axles, weight per axle, or maximum gross weight. SmithCo’s expert engineers have developed a large selection of train configurations for this reason, and are happy to advise you on the best choice for your location.


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