Why do trains need to change heads (train numbers)?

This is because locomotive traffic has ended, and the Ministry of Railways has divided all parts of the country into different traction sections, and each section has a different length. At the end of a locomotive pulling section, but the train has not yet reached the end, the locomotive will be replaced in the next section. The fundamental purpose is to ensure the safe operation of the locomotive and the driver's rest,

technical requirements and the need to change engines in case of failure, traffic problems, involving locomotive performance, fuel carrying capacity (specifically referring to diesel locomotives), Line conditions, driver continuous working hours and crew system.

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Extended information:

In the past, it was a steam locomotive, which burned coal with water. When the coal was almost burned, it had to be added, and coal and water were added. It takes a lot of time and requires materials and facilities (water cranes in coal plants, etc.). Therefore, the distance a motorcycle can travel is limited. After running for a while, you have to turn around and go home quickly. You can only work again after you have eaten and drank enough.

At the same time, routes in various places also have their own characteristics. Drivers traveling on routes they are familiar with are safe and guaranteed.

Now that electric or diesel locomotives are used, eating and drinking is not a big problem, and the traffic is long. There are many (I have personally witnessed the continuous traction experiment of an internal combustion engine for more than 2,000 kilometers). The main reason for replacing the engine head is management and safety considerations.