Sentence:  Ingots that fully pass inspection are moved along the <WSD>rollway</WSD> to a point opposite to which they are to be piled, and then piled by means of a small magnet on an air hoist carried by a movable wall jib crane. 
Meaning of the word marked with <WSD> tags:  A series of cylindrical metal rolls placed between two rails and spaced apart, used to convey materials along a production line.