VIENTIANE, July 23 (Xinhua) -- The China Railway No. 8 Engineering Group (CREC-8) has drilled through Houay Phoulai Tunnel, a highly risky and a key bottleneck project along the China-Laos railway, on Thursday.
The 6,969-meter Houay Phoulai Tunnel, in northern Laos' Oudomxay Province, some 400 km north of the Lao capital Vientiane, goes through harsh geological conditions, which makes its construction highly risky, and its completion lays a timely foundation for the coming beam setting and rail tracks' installation.
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