An electronic display panel (10, 150) comprising: a single top elongate rail (12, 152) having a length extending from a first end to a second end, the single top elongate rail comprising: a front wall in a first plane, the front wall comprises a first transverse thread receiving slot on backside of the front wall, the first transverse thread receiving slot extends the full longitudinal length of the top rail; a back wall in a second plane that is parallel with the first plane, the back wall comprising a second transverse thread receiving slot on the backside of the back wall, the second transverse thread receiving slot extends the full length of the top rail; a side wall in a third plane that intersects the first plane at a first angle and intersects the second plane at a second angle, the side wall meets the front surface at a corner edge and separates the front wall from the back wall by a predetermined distance; a first longitudinal receptacle (111, 112) adjacent to the corner edge, the first longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; and a second longitudinal receptacle (106, 107) in the back wall, the second longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; a first display module (22, 156) operable to produce a display, the first display module comprising a front side from which the display is viewable, a top edge attached to the first transverse thread receiving slot with at least one transverse threaded fastener, and a bottom edge and a back panel (40, 176) attached to the second transverse thread receiving slot on the backside of the back wall of the top elongate rail with at least one transverse threaded fastener (42, 178). a single top elongate rail (12, 152) having a length extending from a first end to a second end, the single top elongate rail comprising: a front wall in a first plane, the front wall comprises a first transverse thread receiving slot on backside of the front wall, the first transverse thread receiving slot extends the full longitudinal length of the top rail; a back wall in a second plane that is parallel with the first plane, the back wall comprising a second transverse thread receiving slot on the backside of the back wall, the second transverse thread receiving slot extends the full length of the top rail; a side wall in a third plane that intersects the first plane at a first angle and intersects the second plane at a second angle, the side wall meets the front surface at a corner edge and separates the front wall from the back wall by a predetermined distance; a first longitudinal receptacle (111, 112) adjacent to the corner edge, the first longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; and a second longitudinal receptacle (106, 107) in the back wall, the second longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; a front wall in a first plane, the front wall comprises a first transverse thread receiving slot on backside of the front wall, the first transverse thread receiving slot extends the full longitudinal length of the top rail; a back wall in a second plane that is parallel with the first plane, the back wall comprising a second transverse thread receiving slot on the backside of the back wall, the second transverse thread receiving slot extends the full length of the top rail; a side wall in a third plane that intersects the first plane at a first angle and intersects the second plane at a second angle, the side wall meets the front surface at a corner edge and separates the front wall from the back wall by a predetermined distance; a first longitudinal receptacle (111, 112) adjacent to the corner edge, the first longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; and a second longitudinal receptacle (106, 107) in the back wall, the second longitudinal receptacle extends longitudinally from the first end to the second end and is accessible from both the first end and the second end of the top rail; a first display module (22, 156) operable to produce a display, the first display module comprising a front side from which the display is viewable, a top edge attached to the first transverse thread receiving slot with at least one transverse threaded fastener, and a bottom edge and a back panel (40, 176) attached to the second transverse thread receiving slot on the backside of the back wall of the top elongate rail with at least one transverse threaded fastener (42, 178).