RDI Rail-Our history begins with a few simple thoughts shared by the owners of Seaside Builders who scribbled some “shop talk” on a napkin one day over lunch. A simple idea on how to contend with hard Jersey Shore weathering on their custom homes led to the formation of Railing Dynamics, Inc., the number one vinyl railing manufacturer in the US and the leading innovator of low-maintenance, easy to install, quality railing systems, porch post systems, and complete accessory lines.