HO-SCALE CONCRETE CULVERTS - Two HO-Scale Culverts (1:87) Measures: 2-1/2" D x 1-1/4" W, 1-1/16" H. 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. Assemble with Woodland Scenics Flex Paste (WD1205) or white glue.