... Material: U71Mn Standard: GB3426-824. Japan& Korea Standard Rail Specification: 37A, 50N, CR73 Unit Weight:37.2kg ... 9m Material: 55Q Standard: South Africa Standard6. English Standard Rail Specification: 60A, 60R, 70A, 75A, 75R, 80A, ... 55Q, U 71Mn Standard: BS11:19857. India Standard Rail...... Specification: CR80, CR100 Unit Weight: 63.69kg/m ... 82 6-30kg railroad light steel rail for farm or mining steel ...