Why should we be careful when seeing “Double Bows Prohibited” on trains? What does this mean?

With the continuous development and progress of railway transportation, people’s travel has become more and more convenient. People can solve their short and medium-distance travel needs by taking public transportation or self-driving. During travel, trains, high-speed rails, and airplanes have become the main means of transportation for people, especially trains and high-speed rails. The passenger flow will surge during holidays. The difference between trains and high-speed rails and airplanes is that trains have a price advantage. After all, Nowadays, many people prefer to save a little money and choose to take trains or high-speed rails. People who often take trains know that trains mainly rely on wires on the top to transmit power, so they are also called electrified trains, but some friends will be confused. The confusion is that there are often signs saying "No double bows" written next to the train tracks. This inevitably makes people wonder, what does this sign mean and what is its purpose?

In fact, "Double Bowing is Prohibited" is mainly written for insiders. We ordinary passengers basically cannot understand it, and it is difficult to understand its intention. Is it forbidden for others to play with bows and arrows on the railway tracks? The answer is of course not. This is a slogan that only train drivers can understand. It is a warning slogan that reminds train drivers to be careful. So what does it mean specifically? Let’s take a look together, now we finally know the answer.

First of all, let’s explain what is a double bow? The double bow refers to the arm connected to the wire on the roof of the train or high-speed train. It has a professional name called pantograph. Generally, trains have two identical pantographs, which are distributed in front of and behind the train. The main function of the pantograph is to receive the current on the wire and convert the current into power so that the train can move forward. Many people may ask, since there are two pantographs, wouldn't raising both of them make the current more stable and the train more powerful? In fact, the train can raise two pantographs in places where there is no "No Double Bow" sign. However, if "No Double Bow" appears, only one pantograph must be used. The reason is to prevent short circuits and tripping, because the train The wires above are actually distributed in sections. The wires in different areas are powered by different power supplies. When the train passes through the sections, different currents are generated between the different wires, and short circuits and trips are prone to occur, so in " In places where "double bows are prohibited", train drivers will be very careful when they see it, and will only use one pantograph as required.

Of course, in places where there is no "No Double Bow" slogan, trains can use double bows. Using double bows will produce a more stable current, and the performance of the train will be better in all aspects. Finally, the principal believes that we no longer have to be confused when we see the ban on double bows next to the train. In fact, it is mainly to warn the train driver not to use double bows. After reading this, do you finally understand?