Railway frog is an important part of the rail switch (rail turnout) and the intersection of two railway lines. Whether a railway train can safely cross from one railway to another, the railway frog plays a vital role. High-quality railroad frog can ensure the train transfer smoothly to another rail line, and the passengers in the train won’t feel abnormal bumps. On the contrary, if the rail frog technology is not good or the turnout in railway is selected with inappropriate rail frog, the irregularity will occur when the train passes. Therefore, the choice of high-quality railway frog is particularly important for the safety of the rail switch and even the whole railway line.

The rail frog can be divided into a straight frog and a curved frog according to the plane type, and it also can be divided into a fixed frog and a movable point frog (swingnose crossing) by structure type.