2021-8-17 · CRCC ( 01186) 5.04 ↑. Business Overseas. World''s Longest Heavy-haul Railway Tunnel H... On August 21, the world''s longest heavy-haul railway tunnel, Xiaoshan Tunnel of the Menghua Railway,... More>>. The World''s First Ultra-high-pressure Tunne... On Aug 21, the world''s first ultra-high-pressure tunnel through the Yangtze River, built by CRCC ...