A rectangular guide way having side and end segments carry a plurality of pucks in each segment. The pucks have side edges parallel to the side segments and end edges parallel to the end segments so that the pucks ride smoothly along the guide way. The side and end segments are connected at corners where the pucks are transferred from guiding along the side edges in the side segments to guiding along the end edges in the end segments. A walking beam with a plurality of upwardly extending pins is moveable alone each of the segments. In an upper engagement position, the pins of the walking beam engage holes in each of the pucks in its segment. In this way all pucks are indexed an exact amount along each segment. A locking beam which is moveable only upwardly and downwardly may also be provided for firmly holding the pucks when the walking beams are disengaged therefrom.
