Because the load of trains is very large, in order to withstand the pressure exerted by vehicles.
1. The top surface of the rail must have a certain width and thickness.
2. In order to improve the stability of the rail, the bottom surface of the rail must also have a certain width;
3. In order to match the wheel with a wheel flange, the rail must have a certain height.
The "I"-shaped rail can just meet these three requirements and is also recognized as the best rail section structure.
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