连接云川两省的重要交通干线——成昆铁路,是在毛主席发出“成昆线要快修”的伟大号召下于七○年七月一日胜利建成通车。全程1.085公里,北起四川成都南抵云南昆明,被称为“地质博物馆”的成昆路,全线逶迤在云川两省万水千山之间,工程之艰巨,桥梁隧道之总长度四百多公里,乃是全路干线所罕有。噪声是一种有损健康已为国内外所公认的公害之一,据“国外科技动态”刊物所 Chengdu-Kunming Railway, an important traffic artery connecting the two provinces of Yunnan and Sichuan, was opened to traffic on July 1, 1970, under the great call issued by Chairman Mao for the “quickening of the Chengdu-Kunming Line”. The entire process of 1.085 km north of Chengdu, Sichuan Chengdu arrived in southern Kunming, known as the “Geological Museum,” Cheng Kun Road, across the board between the two rivers Wanqianshanqian, the arduous project, the total length of the bridge tunnel more than 400 kilometers, But the whole road is rare. Noise is a detrimental health has been recognized as one of the public nuisance at home and abroad, according to “foreign science and technology” publication