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Description:Heavy rail:1) 38kg, 43kg, 50kg2) Standard: GB2585-813) 50Mn/U71Mn1) 37kgA, 50kgN, CR732) Standard: KSB8106-80 and JIS E1101-933) U71Mn1) BS75R, BS80A, BS113A2) Standard: BS11:19853) U71Mn