Linyi is located in the southeast of Shandong Province, bordering the Yellow Sea, Rizhao in the east, Zaozhuang, Jining and Tai 'an in the west, Zibo and Weifang in the north and Jiangsu in the south. It is located at the junction of Yangtze River Delta Economic Circle and Bohai Economic Circle, the port-facing industrial belt in southern Shandong, the demonstration base of marine industry linkage development, and the national key development area of Donglonghai.

By the end of 20 16, Linyi had a total area of 17 19 1.2 square kilometers and a population of1/240,000, making it the largest and most populous city in Shandong Province. It has jurisdiction over three municipal districts of Lanshan, Luo Zhuang and Hedong, and nine counties of Tancheng, Lanling, Yishui, Yinan, Pingyi, Feixian, Mengyin, Junan and Linshu. ?

Historical evolution:

Linyi has a long history and is one of the important birthplaces of Chinese civilization. ?

500,000 years ago, human ancestors created an ancient civilization on this land.

Many written symbols were found in the early Paleolithic cultural relics in China 200,000 years ago. Now, nearly 100 pieces of microlithic cultural relics found in the Yihe and Shuhe river basins were created by human beings 1 10,000 to 20,000 years ago.

Although there are many kinds of vehicles, their structures are similar. This should be said to be the credit of standardization and the need of large-scale production line. With the development of society, the progress of science and technology and the change of demand, the appearance of railway vehicles has also begun to change, especially the passenger cars are no longer the same old faces. However, their basic structure has not changed obviously, but the specific parts have more scientific and advanced structural design.

Generally speaking, the basic structure of a vehicle consists of five parts: body, underframe, running gear, coupler buffer device and braking device.

The car body is the part of the vehicle carrying goods or passengers, and it is also the basis for installing and connecting other parts of the vehicle. The bodies of early vehicles were mostly wooden structures, supplemented by steel plates and bow bars. Modern automobile body is mainly steel structure or light metal structure.