Yan Jiecheng and his colleagues set up several factories for this project.
One of them is a new railway rail welding factory near the railway line in the southern suburbs of Beijing.
The 100 meter rails specially made by the factory are welded into 500 meter long rails.
Seamless rail is the key equipment to ensure the safety of high-speed railway.
The straightness error within 1m at the rail interface shall not exceed 0.2mm.
The high smoothness between rail joints ensures the safety and comfort of passengers.
The Beijing Tianjin special line must have this welding factory if it is to be seamless.
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