A ski-rail is provided for a wagon having a side rail with a lip and four wheels, which consists of an assembly for forming a segmented railing, which is assembled onto and about the lip on the side rail of the wagon, to help keep a child in the wagon when used during the summer months. A unit for forming four runners form the disassembled segmented railing assembly is then assembled onto the four wheels, so as to convert the wagon into a sled, to allow it to be used on ice and snow during the winter months.