(mechanical engineering) Pulleys to lead a driving belt or rope in a new direction or to keep it from leaving its desired direction. Tracks that support and determine the path of a skip bucket and skip bucket bail. Tracks guiding the chain or buckets of a bucket elevator. The runway paralleling the path of the conveyor which limits the conveyor or parts of a conveyor to movement in a defined path.
(mining engineering) Steel, wood, or steel-wire rope conductors in a mine shaft to guide the movement of the cages. Timber, rope, or metal tracks in a hoisting shaft, which are engaged by shoes on the cage or skip so as to steady it in transit. The holes in a crossbeam through which the stems of the stamps in a stamp mill rise and fall.

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