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Chinese engineers in south China's Guangdong Province Sunday succeeded in cracking a hard nut problem in building the Foshan-Dongguan intercity railway by digging a railway tunnel just 5.6 meters below an existing busy underground railway line. The construction is set to be completed by 2020, which will be of great significance to the construction of the One-Hour Urban Economic Sphere in the Guangdong-Hong Kong-Macao Greater Bay Area.