Why are there trains in the world? Why come to a train

In 1781, the train pioneer George. Stephenson was born into a family of English miners. Until the age of 18, he was illiterate.

Despite the ridicule of others, he sat in the classroom with seven or eight-year-old children to study. In 1810, he began to build steam locomotives, and the steam locomotives had a bright future. In 1817, when Stephenson decided that he would be in charge of the construction of the railway line from Liverpool to Manchester, it would be entirely carried out by steam locomotives.

However, conservative railway owners were skeptical of the capabilities of steam locomotives. They proposed that a tractor fixed on the side of the railway should be used to tow the train with a towing cable. In order to convince people of the train's performance, Stephenson built the "Rocket" locomotive with good performance.

The locomotive's excellence finally made skeptics change their minds, and the Liverpool-Manchester Railway became the first railway line in the world to be transported entirely by a steam engine.

When taking bullet trains and high-speed trains, a train will come in front of you, and there will be tendencies when you meet. This phenomenon is caused by the influence of what we commonly call train wind. Due to the viscosity of the air, when the train is running at high speed, the air that adheres to the surface of the train adheres to the surface of the train and moves with the train, and the air layer adjacent to the surface of the car body is affected by the viscous friction of the inner layer of air, and also flows with the train at a certain speed, and its flow rate decreases with the increase of the distance between the air layer and the surface of the car body.

When the distance increases to a certain value, the air is no longer affected by the operation of the train, and we call the layer of air affected by the operation of the train the boundary layer. The air in the boundary layer flows forward with the train, and this air flow is called the train wind.

The train wind increases as the train speed increases, so that when a high-speed train staggers through adjacent tracks, it generates a train intersection pressure wave, which makes passengers feel this phenomenon. We can do such an experiment, as if I blow into two pieces of paper, then the two sheets will be separated or closed, according to the simple imagination, it must be separated, because if you blow in the middle, the paper branches should spread out to both sides, but the faster you blow, the closer the two strips of paper will be. The flow of air between the two strips of paper reduces the pressure on the inside of the strip, and the pressure on the outside of the strip is greater than the pressure on the inside, resulting in the phenomenon that the two strips of paper are closed.

Experiments have shown that the speed of air flow is inversely proportional to the pressure, and the faster the air flow, the lower the pressure.

The distance between the two lines of the railway line and the distance between the platform and the line are set at home and abroad according to the safety distance determined by scientific tests such as the environment, line grade, train running speed, vehicle type, safety distance of the human body affected by it, and the pressure of the eardrum, which is in line with the safety distance and safety guarantee. Therefore, when the high-speed rail is wrong, it is normal for passengers to talk about the feeling that the train will tip outward.

The higher the air velocity, the lower the air pressure. When the trains meet, the air in the middle of the clip will flow rapidly and the air pressure will decrease. Since the air pressure on both sides of the train is normal, the high pressure will flow to the low pressure, causing the two trains to tilt towards the middle, which is one of the reasons why the train is tested before it is officially operated, and it is also the reason why the train station has a safety line (people inside the safety line can be sucked into the train).

But you don't have to worry, if there is an accident in the encounter, the train will be ruined long ago in the testing phase.

In addition, the EMU has a high technical content in maintaining stability, and when the EMU runs smoothly (i.e., there is no encounter, steering chain, acceleration, deceleration, etc.), the coin can stand smoothly in the car, and it will not shake too much when the EMU will meet.

Because at the same time, if He Hezha comes to a lot of trains, it is not easy to control the passenger flow, and sometimes he will miss his own train, the corresponding train interval will be relatively fast, and the passengers will not have much time to prepare when they are quiet, so it will seem to be more hurried, and the state will not be too good, so some places will reasonably plan the number of trains according to the changes in passenger flow and other circumstances, which are within a reasonable range.

Summary. Diesel locomotives: diesel locomotives are divided into electric transmission and hydraulic transmission; Electric drive locomotives, mainly made in China by the Dongfeng series (Dongfeng is produced in Dalian, Dongfeng 1-3 has now been scrapped, and now Dongfeng 4-12 is used); Hydraulic transmission locomotives, domestically produced by the Dongfanghong series.

2) Electric locomotives: electric locomotives are divided into alternating straight type and alternating locomotives, and the domestic electric locomotives are mainly Shaoshan (SS) type, and now the high-power electric locomotive Harmony produced by CNR Group. 3) EMU:

China now mainly uses the Harmony EMU.

Hello. That's basically the case with today's modern trains.

Diesel locomotives: diesel locomotives are divided into electric transmission and hydraulic transmission; Electric drive locomotives, mainly made in China by the Dongfeng series (Dongfeng is produced in Dalian, Dongfeng 1-3 has now been scrapped, and now Dongfeng 4-12 is used); The hydraulic conveyor is good to dress up the car, and the domestic one is dominated by the Dongfanghong series. 2) Electric locomotive:

The electric locomotive is divided into AC straight type and AC type, and the domestic electric locomotive is mainly composed of the hidden sock Shaoshan (SS) type, and now the high-power electric locomotive Harmony produced by CNR Group. 3) EMU: China now mainly uses the Harmony EMU.

At present, the weather is cold, pay attention to keep warm and protect yourself<>

Types of railway trains can be divided into freight cars and passenger cars according to the load; There are also vans that combine both. Some of the passenger cars are high-speed trains.

According to the classification of rails, trains can be divided into ordinary tracks, monorails, and maglevs. There are also cog railways that are specially used for mountain railways, and funicular railways that are pulled by cables.

According to the power of the train**, there are steam locomotives, diesel locomotives, electric locomotives for traction, and self-propelled EMUs.

Some trains are pulled by more than one locomotive. In North America, vans are often made of.

Three, four or even five locomotives towed.

There are also trains that are specifically designed for track maintenance.