平底轨 meaning in English

flat bottom rail
flat-bottom rail
foot rail

Iron and steel products . hot - rolled . 26 kg m flat bottom railway rail and fishplates
钢铁产品.热轧材.每米26kg重平底轨和鱼尾板
Railway fixed equipment . sawing and drilling of flat - bottom rails of types superior or equal to 26 kg m , of 60 g , 70 g grooved rails and their fischplates
铁路固定设备.大于kg m的g g形平底轨及其鱼尾板的切割和钻孔