China-Laos Railway witnessed the breakthrough of Tunnel Mengcun No.1 constructed by China Railway No.8 Engineering Group, a subsidiary of CREC, recently. The 1,258-meter single-track Tunnel has a maximum depth of 208 meters. The Project Department, facing the difficulties of complex geological conditions, large amount of water flowing into the tunnel and inconvenient transportation of materials, optimized the construction plan constantly. On the basis of ensuring quality, quantity and safety, the construction took 420 days, 12 days earlier than the plan.
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