| 摘要 |
A rail car having two sets of supporting wheels swingable to upright operative car supporting positions at different elevations above the car, from laterally displaced inoperative positions; a track system having rails that converge and diverge at junction points, parallel reaches in said rails at the incoming ends of the junction points spaced vertically to support one set of wheels and register in unsupporting relation to the other set of wheels while the other wheels are moved into registry with the other track, vertically divergent portions at the ends of the parallel reaches arranged to transfer the support of the car from one set of wheels to the other, and selectively operable means to swing the sets of wheels to operative position to effect switching of the car from one rail to the other at transfer points.
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