Abstract: An operable wall system which is especially desirable for use with large and/or heavy wall panels can be constructed so that each panel in the system is supported from a track structure by two separate trolleys. The track structure includes a terminal section having two parallel end sections joined to the main portion of the track structure through a junction. This junction is provided with cams which cooperate with differently oriented flange wheels on successive trolleys so that the panels can be moved between a position in which they are aligned with one another beneath the main portion of the track structure and a position in which they are suspended from the end sections and are located in side by side relationship.