| 摘要 |
Apparatus to travel on primary rails includes: (a) a truck having primary wheels adapted to roll on primary rails under the wheels; (b) and side wheel structure carried by the truck and projecting at the side thereof, for car stabilizing upward engagement with elongated auxiliary rail structure above the side wheels, (c) three being a turnable having a vertical axis of pivoting, there also being extensions of the primary rails and of the auxilary rail structure on the turntable, all at one side of that vertical axis.
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