Train (English: Train, German: Züge), also known as railway train, refers to vehicles running on railway tracks, usually consisting of multiple carriages, and is one of the important means of transportation for human modernization. As of 202 1, there are two kinds of green leather cars and emus in China.

The most important machine in human history, called steam locomotive in the early days, has an independent orbit. Railway trains can be divided into freight cars and passenger cars according to their load capacity, and there are also mixed passenger and freight cars, but they will produce a lot of carbon dioxide and pollute the environment.

Trains are a typical example of human transportation using fossil energy. 1804, the world's first steam locomotive was built by British mining technician Drivesk using Watt's steam engine, with a speed of 5 to 6 kilometers per hour. Because coal or firewood was used as fuel at that time, people called it "train" and it has been used ever since. 1840 On February 22nd, the world's first real train running on the track was designed by Kangwa engineer Charlie Levisik.

1879, Siemens electric company of Germany developed the first electric locomotive. ?

With the popularity of trains, the way people ride horses (or take other livestock as the main power) has changed. The early train carriages in China were green, so they were called green leather trains.

In the early days, the traditional train consisted of one or three locomotives pulling several carriages or freight cars. In modern new trains, there have been many EMU trains with self-powered carriages. In Shanghai, there is already a maglev train line from Longyang Road subway station to Shanghai Pudong International Airport.