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A modified form of direct-rope haulage, in which a power-driven reversible
pulley (surge pulley) is used instead of a drum. The full trams are hauled
up on one end of the rope while the empties go down on the other end. It
involves a double track or a bypass midway on the haulage plane. The
descent of the empty trams assists in balancing the load being hauled
upwards. Nelson
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