JIS Standard Steel Rail are mainly composed of head, foot, inner and edge parts. The head is the uppermost part of the track rail, showing a “V” shape, used to guide the relative position between the wheel rails; the foot is the lowest part of the track rail, showing a flat shape, used to support the weight of goods and trains; The interior is the internal structure of the track rail, including the rail bottom, shock-absorbing pads, tie bars, etc., which can make the track stronger, while also playing the role of shock absorption and maintaining tolerances; the edge part is the edge part of the track rail , exposed above the ground, mainly used to disperse the weight of the train and prevent rail toe erosion.