JIS Standard Karfe Rail ya ƙunshi kai, ƙafa, ciki da sassa. Shugaban shine mafi girman ɓangaren layin dogo, yana nuna siffar "V", ana amfani da shi don jagorantar matsayi na dangi tsakanin raƙuman ƙafa; ƙafar ita ce mafi ƙasƙanci na layin dogo, yana nuna siffa mai faɗi, ana amfani da ita don ɗaukar nauyin kaya da jiragen ƙasa; Cikin ciki shine tsarin cikin gida na layin dogo, wanda ya haɗa da ƙasan dogo, pads masu ɗaukar girgiza, sandunan ɗaure, da sauransu, waɗanda ke iya sa waƙar ta fi ƙarfi, yayin da kuma ke taka rawa na shaƙar girgiza da kiyaye haƙuri; Bangaren gefen gefen layin dogo ne, wanda aka fallasa sama da ƙasa, galibi ana amfani da shi don tarwatsa nauyin jirgin da hana yatsan ƙafar dogo.