How does the train drive the carriage?

You are a rookie and don't understand the basics. Let me make up lessons for you.

The following are my answers to other people's questions. You can refer to them. My name is Tuohu.

Why does the train start slowly?

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If the bus is a bus, it is because the coupler should be straightened, because after parking, the front and rear couplers of each car will be in a loose state, leaving a large gap. If you encounter strong traction, you will have a very big collision and a great impulse. Therefore, it is necessary to walk slowly for about 20 meters, slowly stretch the coupler of the whole train, and then accelerate sharply to be stable.

If we talk about trucks, then I don't need to talk nonsense. There are so many trains that it is impossible to drive away like a car.

If you have seen a truck start, you should have an impression: because a truck and a bus are just the opposite, they have to be loaded violently from the beginning, so you will find that the couplers of the whole train will make a continuous' jingle' sound from front to back, which is very spectacular.

How to drive multi-machine traction;

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1, 4 locomotives with several wagons is possible, not because of the slope, but because an old steam locomotive can handle several locomotives.

Generally speaking, it is because of the arrangement of the locomotive dispatcher of the railway bureau that three locomotives need to be sent back to their destination, where the traffic volume is too large to connect the locomotives to the highway.

It is also possible that this section was originally a four-machine traction, and the train was pulled and returned together. Because the route of locomotives is fixed, even if there is no traffic coming back, the four locomotives will go together. But I only heard that there are four machines pulling 20 thousand tons on the Daqin line, and there seems to be no one here in Qinling.

There are several questions in this second question, and I will answer them one by one.

In the case of multi-machine traction, there is usually a reconnection control circuit, which connects the cars through reconnection cables, so the locomotive driver can control the synchronous traction of all the locomotives behind him on the first locomotive.

As for the collision, it is impossible, because they are connected, the traction force is in the same direction, and the coupler buffer device buffers in the middle.

As for traction, of course, multiple machines are higher than single machines. You think so because you don't understand the principle of traction. Traction force is the force generated by the tangential torque generated by wheelset rotation acting on the rail, and the magnitude of this force must depend on the friction between wheelset and rail at the same time. If the friction is too small and the force is too large, the wheelset will idle and will not produce traction. Of course, the traction force also depends on the rotating torque of the wheelset. Therefore, the traction of any locomotive cannot be greater than the friction acting on the wheels (that is, the force that the weight of the car body presses on the wheels can be said to be a fraction of the weight of the car body). Looking back, the power of locomotives is generally designed to be large now, so it is not his fault that the traction is small for the wheels. He has reached the limit, which generally depends on the pressure of the locomotive on the track. You can even understand that the traction depends on the weight of the locomotive to some extent, and the weight of a single locomotive cannot be infinite. Therefore, in order to improve the traction of trains, we must increase the number of locomotives.

Your concern is justified, but it is basically unnecessary. Computer control is only an auxiliary means, and the foundation of railway equipment safety still lies in the centralized chain of turnout signals at each station. Chain has formed a set of strict chain logic long before the birth of computer. For example, after a signal is turned on, it is impossible to change the switch on the road. If the turnout is temporarily changed (for example, the locomotive runs a red light to crush the turnout), the signal will be automatically turned off immediately, and so on.

As for your question about the speed of multiple locomotives, I can tell you that all locomotives in the country can run within 50 meters 10 km (that is, the difference between speed and distance displayed by the black box). If this error is exceeded, the vehicle must be detained immediately, and the black blind and related equipment should be inspected and debugged.

Complement your answer:

There is an air duct under each car, which is right. This is an air duct filled with compressed air, generally with a constant pressure of 600Kpa (bus) or 500Kpa (truck). This has two purposes: one is to inflate the vehicle brakes to make the train brake or release under the control of the locomotive driver, and the other is to inflate the air springs to make the passengers ride more comfortable and stable.

Of course, he didn't pull the train, and the air duct couldn't provide traction.