由中铁苏局和隧道局共同承建的关角隧道平均海拔3500米,全长32.6公里,是目前世界在建最长的高原铁路隧道。科技含量高,工艺先进建设者们奋力拼搏,攻难克险,工程项目快速有序推进。 The tunnel, which is jointly constructed by the China Railway Administration Bureau and the Tunnel Bureau, has an average altitude of 3,500 meters and a total length of 32.6 kilometers. It is the longest plateau railway tunnel currently under construction in the world. High-tech, advanced technology builders are struggling to attack hard grams of dangerous projects in a rapid and orderly manner.