Abstract: A device for lifting and lowering a rail track section in between two rail tracks mounted in different vertical levels and including an elevator carrying the rail track section is improved by means of a latching structure at each end of that section, each including a rotatable latch element with rounded ends, for cooperating with abutment and counter latch surfaces respectively at ends of the rail tracks, at least an upper one of the tracks has passage ways and openings for the latch element to pass through from below; and the latch elements are keyed together for turning so that they will rest on the respective counter latch surfaces and thereby hold the rail track section in an aligned disposition for one or the other of the two rail tracks.

Abstract: A forklift mast assembly for attachment to a self propelled vehicle includes a pair of outer masts horizontally spaced from each other, and a pair of inner masts disposed just inwardly of the outer masts for up and down rolling motion relative to the same. Each outer mast is of U shaped cross section, defining a space opening inwardly or toward the other outer member for rotatably receiving an inner roll on the bottom end of the associated inner mast. Each inner mast is of H shaped cross section, defining an outwardly open space for rotatably receiving an outer roll on the top end of the associated outer mast, and an inwardly open space for rotatably receiving one pair of carrier rolls on a prong carrier. The outer masts are further rimmed to bear the axial thrust of inner rolls when the prong carrier is loaded out of the perpendicular in the plane of the mast assembly. Preferably, the inner masts are also rimmed to bear against the outer rolls and, if desired, against the carrier rolls as well.