Utilizando bujes de cobre bimetales de alta calidad; sistema de reciclaje de aceite bien lubricado; sello flotante de aleación de alta dureza resistente a corrosiones y anillo de goma elástica; Enhancement of wear resistance of rail surace by medium frequency quenching The axle is made of hich quality 45# steel which is enchanced the wear resistance by tempering and high frequency surface heat treatment.