70 plate sections 314 and 315 are horizontally spaced apart to provide a linear track path 323 in communication and aligned with track path 320 track paths 321 322 and 323 feed the trolleys moving therealong into the track paths of track sections 27 28 and 29 respectively guides used to selectively route trolleys passing along track path 320 into one of track path 321 322 or 323 include an arrangement of guide plates fixedly mounted to the underside of top plate 310 in order to ensure engagement with the upstanding diverter blades of both the lead trolleys and the trailing trolleys each guide plate on switch assembly 50 is sufficiently tall so as to project down from the top plate to which it is attached to a height slightly below the tops of the shorter upstanding blades of the side diverter elements of the trailing trolleys plates of this standard height also naturally project below the tops of taller upstanding blades of the side diverter elements of the lead trolleys guide plate 325 serves to route trolleys moving along track path 320 into track path 321 in the process of forming a wall along track segment 27 arcuate guide plate 325 is structured such that diverter blade 125 of trolley 100 and diverter blade 139 of trolley 130 slide along the laterally outer face of guide plate 325 to route trolleys 100 and 130 into track path 321.