RANDOM STONE CULVERTS - N-Scale. More super detailed castings. Where there are embankments, there is water runoff to control. No serious railroad scene would be without a detailed culvert or two to add realism. Unpainted white hydrocal. Two per pack. Approximate outside dimensions: 1-7/8" W x 3/4" D x 13/16" H. (4.76 cm x 1.9 cm x 2.06 cm).