A rail slideably supports transparent checkout dividers with open bottoms in an upright position along a sidewall of a checkout conveyor. The rail has a perpendicular wall formed on a base. The base is affixed to the top of the sidewall or into a channel formed on the sidewall and the dividers are slid along the rail towards a distal end for access by the customers. A stop prevents the dividers from leaving the rail at the distal end. The perpendicular wall extends upwards into an open bottom in the checkout dividers and keeps the dividers in the upright position allowing any advertising displayed thereon to be un-obscured and oriented to be visible at all times.