伊人久久大香线蕉综合AV_亚洲好穴_WWW激情内射在线看_亚洲色网址_欧美日韩成人一区_国产吃奶摸下激烈视频无遮挡

Welcome to Aigre?

more>>Industry Overview

News

The Origin of Railway Gauge Standards
addtime:2022-04-12click:422


The history of railway gauge can be traced back to the coal mine transportation era in the UK, where the track spacing was set at four feet eight and a half inches (1435mm), which later became the standard gauge for railway systems worldwide. In 1825, Stephenson, the inventor of the steam locomotive, adopted this gauge, and with the spread of railway technology, this standard gradually gained adoption in the United States, Germany, and other regions.

China's railway construction began in the 1880s, when foreign powers exported railway technology and products to China through loans, bringing various technical standards with them. Therefore, China's railway gauge system initially showed diverse characteristics, with British, French, Russian, and other standards coexisting. This chaotic state of gauge systems persisted for nearly a century until the late Qing Dynasty, when there was a gradual move towards unification.

During the process of unifying the gauge system, the influence of the UK was the most significant. Since most of China's earliest railways were built or assisted by the British, the British gauge was widely used in China. However, some railways also adopted standards from other countries, such as the French standard for the Lu-Han Railway and the Russian standard for the Eastern Qing Railway.

To address this issue, the Chinese government and relevant authorities began to carry out gauge system reforms. They gradually unified the national railway gauge system by formulating relevant regulations and standards. Ultimately, the standard with a British gauge of four feet eight and a half inches, Martin steel as the material, and a mainline track weight of 85 pounds was established as the standard for China's railways. This standard not only applies to railway mainlines but has also been gradually extended to other railway lines.

Since then, China's railway gauge standard has been followed to this day and continues to develop and improve. The establishment of this standard has not only improved the operational efficiency and safety of China's railways but also laid a solid foundation for the modernization of China's railway development.


主站蜘蛛池模板: AV无码高潮在线观看免费 | 亚洲a一级视频 | 久久精品一区二区无卡顿 | 亚州精品成人 | 啪啪自拍视频 | 天天爽亚洲中文字幕 | 午夜精品久久久内射近拍高清 | 4虎最新网址 | 草莓香蕉樱桃黄瓜视频 | 国产免费一区二区三区四在线播放 | 亚洲三区在线播放 | 亚洲国产精品精 | 四虎永久影院 | 丰满妇女做a级毛片免费观看 | 久久AV无码乱码A片无码波多 | 精品国产乱码一区二区三区 | 国产不卡网站 | 性生大片免费观看668 | 谍战片惊弦免费观看 | 蜜桃人妻无码AV天堂三区 | 手机在线播放国产女主播 | www.7788久久久久久久久 | 99视频在线精品免费观看6 | 欧美成人一卡二卡三卡 | 九九影院最新理论片 | 韩日在线一区 | 97超碰站 | 日本无遮挡边做边爱边摸 | 国产69精品久久久久9999APGF | 毛片新网址 | 国产欧美日韩精品专区 | 国产精品乱子乱XXXX | 豪放女大兵免费观看 | 亚洲成人精品在线观看 | 在线免费h视频 | 91在线精品秘密一区二区 | 日本真人做人爱一区二区三区 | a级a做爰片免费观看 | 亚洲成AV人片不卡无码 | 强伦人妻一区二区三区视频18 | 国产浴室后入懂色 |