Engineering Marvel

As the country’s first under-river metro train operations started in Kolkata, project experts recounted some unforeseen challenges faced during its construction and the role that two specially-designed German-made tunnel boring machines played to overcome them.Prime Minister Narendra Modi inaugurated the 4.8-km-long underground stretch on March 6 and commercial operations on it began on March 15. The stretch, part of the 16.6-km East-West Metro Corridor, connects Kolkata with Howrah through a tunnel that runs 13 metres…

Construction of one module of the first metro bridge over the Yamuna being built using the cantilever construction technique has been completed, DMRC Managing Director Vikas Kumar has said and added that the entire work is expected to be completed by September. The bridge — the fifth metro bridge over the Yamuna — is being built under Delhi Metro’s ongoing Phase IV project.In a recent interview to PTI, Kumar had said that this state-of-the-art bridge would be “visually appealing” and become an iconic landmark similar to…