A support rail assembly for positioning work-related accessories adjacent a worksurface such as a table. The rail assembly includes a horizontally elongated rail supported in upwardly spaced relationship from the worksurface by a support arm or stanchion. The rail defines therein an elongate slot which permits the mounting of accessories in various positions on the rail which are convenient to the user. The rail is supportable from either the rear edge of a worksurface or may be cantilevered forwardly from a wall adjacent the worksurface or from a wall panel to which the worksurface is attached.