The vehicle chassis has at least one body with a runner roller, rotating about a horizontal axis, and a side guide. The roller runs in or on a rail and has two runner faces (11,12) of different dia. on its peripheral surface, with the second face of larger dia. than the first. Pref. the runner roller is formed by several coaxial, circular drive sections. The second, larger dia. runner face is laterally offset w.r.t. the first one. Typically there are three drive sections, with the two outer ones fitted with the larger dia. runner faces.
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