Explanations:The concept of an under-water Metro rail service is a significant advancement in urban transport infrastructure. It involves constructing a portion of the Metro rail line beneath a body of water, such as a river or a sea, to connect different parts of a city that are separated by water. This type of infrastructure requires advanced engineering and construction techniques to ensure the safety and stability of the rail line under water.
In the context of India, the Kolkata Metro is the first to have an under-water section. The Kolkata Metro, also known as the Calcutta Metro, is the oldest and one of the most extensive rapid transit systems in India. It was inaugurated in 1984 and has since expanded to cover various parts of the city. One of its notable features is the section that runs under the Hooghly River, which is a distributary of the Ganges River. This under-water section is a testament to the advanced engineering capabilities and the need to connect different parts of the city that are divided by the river.
The construction of the under-water section of the Kolkata Metro involved several challenges, including the need to ensure the structural integrity of the rail line under water, the management of water pressure, and the prevention of water ingress. The engineers and construction teams had to use specialized techniques and materials to ensure that the under-water section could withstand the environmental conditions and provide a safe and reliable mode of transport for the residents of Kolkata.
Other major cities in India, such as Mumbai, Kochi, and Chennai, have their own Metro systems, but none of them have an under-water section. The Mumbai Metro, for example, is known for its extensive network and its role in reducing traffic congestion in the city. The Kochi Metro is recognized for being the first fully air-conditioned Metro system in India, providing a comfortable travel experience for passengers. The Chennai Metro, on the other hand, is known for its modern design and efficient service.
Understanding the unique features of different Metro systems in India is important for students preparing for competitive exams, as questions related to urban infrastructure and transport systems are common in such exams. The Kolkata Metro's under-water section is a significant milestone in the development of urban transport infrastructure in India and highlights the engineering and construction capabilities of the country.