tridem
n.— «The non-steering wheels in front of the “bogies” are called “pusher axles” and wheels behind the “bogies” are called “tag axles.” They are single wheels. And they are for wieght regulations. If there are three drive axles in a row they are called a “tridem” instead of “bogie.”» —“Fabulous Peterbilt rigids. Biglorryblog shows the pride of Paccar!” Big Lorry Blog (United Kingdom) Feb. 20, 2008. (source: Double-Tongued Dictionary)
Further reading
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Zack in Santa Barbara, California, is curious about what’s happening when someone interjects the expression Right? in the middle of a sentence or explanation without allowing time for the listener to respond. Expressions like Right? and You know...