First Under-Water Metro: How Specially-Designed German TBMs Helped Connect Kolkata With Howrah
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…