... ,30kg/m. Length:6m,8m,9m,10m,12m Specifications for Railway rail1Standard:GB11264-89, YB222-63, GB2585-20072Size:6kg, 9kg, 12kg ... .2413.4937.2U71Mn10JIS 50 N651531271550.4U71Mn10CR 731001351403273.3U71Mn10CR 10012015015539100.2U71Mn10 Railway Steel Rail Track