目前世界上有窄轨铁路27万多km，占全世界总长130多万公里的21.2％。现在世界米轨铁路年输送能力，单线已达3000万t，复线已达6000万t，并向1亿t发展。我国西部主要是与云南毗连的东南亚各国，如越南、泰国、缅甸，还有马来西亚及印度的一部 At present, there are more than 270,000 km of narrow gauge railways in the world, accounting for 21.2% of the total length of 1.3 million km in the world. Now the annual transmission capacity of the world’s rail transit railways has reached 30 million t in a single line and 60 million t in the second line and has grown to 100 million t. The western part of our country is mainly a group of Southeast Asian countries adjoining Yunnan, such as Vietnam, Thailand, Myanmar and a part of Malaysia and India