Tunnel boring machines (TBM) have been assembled and tested for digging work (Photo: VNA) Hanoi (VNA) – Construction of a 4-km underground section of the underground stations from Station 9 in Kim Ma to Station 12 in Hanoi Station. According to Le Trung Hieu, Vice Director of the Metropolitan Railway Management Board (MRB), tunnel boring machines (TBM) have been assembled and tested for digging work. The first TBM is to be handed over to the investor soon. Hieu said that 20-45 technicians from the Republic of Korea, Italy and Fecon – a contractor of the project – will operate the machine. With the scheduled progress of 10km per day, in optimal