Menggunakan busings tembaga bi-metal berkualitas tinggi; Sistem daur ulang minyak yang dilumasi dengan baik; Segel terapung paduan besi tahan karat tinggi & O-ring karet elastis; 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.