Understand the contact between train and rail

If you have carefully observed, you will find that the contact area between train wheels and tracks is actually very limited. The whole rail is only seven centimeters wide. Aren't such narrow rails afraid of wheels falling off? Generally, people are not allowed to approach the train track, but we can see that the rail of the train is directly pressed on the track, and its speed is actually relatively fast, and the train passes through more bends. However, it is no accident that trains rarely fall off the track due to their own structure.standard rail for railway

In fact, engineers have paid attention to this problem when designing the train track. Usually, we see the train wheels pressing directly on the track, so we feel that the contact area between the wheels and the track is only the part where the track meets the wheels. In fact, besides the contact between the wheel and the rail, there is a rim on the outer side of the wheel, which is larger than the diameter of the wheel, and the part beyond it will get stuck on both sides of the track. Both sides of the wheel are stuck inside the track, so the wheel will not fall off.standard rail for railway

It can also ensure that the wheels are firmly stuck on the track when turning. In addition, the inner side of the track is recessed, which means that the lower end of the track will be wider than the upper end. The recessed part of the track coincides with the protruding part of the wheels, ensuring that the wheels and rails are closely combined in actual use. The rim can not only ensure the wheels to be stable, but also be used to turn the train.

Generally speaking, it is the structure of the tread and rim of the train wheelset, which ensures the smooth running of the train wheelset on the rail; The rim lubrication device reduces the wear of the wheel due to the rail; Sanding device can increase wheel-rail friction and reduce braking distance; The obstacle eliminator and the stone sweeper work together to clean the obstacles on the rail surface and ensure the safe operation of the train.standard rail for railway

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