| 摘要 |
A bogie (10) for running on a guide rail (12) is disclosed. The bogie (10) has a bogie frame (22) supported on a rail (12) by first (41), second (42) and third wheels (23) mounted to it. The first (41) and second wheels (42) are urged into contact against opposite sides of the guide rail (12). The third wheel (23) contacts an upward-facing support surface (13) of the guide rail, bearing the weight carried by the bogie. The first wheel (41) at least is driven by a motor (45) to move the bogie along the guide rail. The second wheel may be an idler or be also driven by a second motor (46).
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