| 摘要 |
A track system comprises a plurality of track components. Each of the plurality of track components has a cross-section comprising an upper section and a lower section, the upper section being wider than the lower section. At least one carrier has a plurality of rolling surfaces having a first and a second rolling surface, which engage opposing sides of at least one of the plurality of track components that correspond to the lower section of the cross-section of the at least one of the plurality of track components. |
