Explanations:The concept of metro systems in India is an important aspect of urban infrastructure and public transportation. Metro systems are rapid transit systems that operate on dedicated tracks, typically underground or elevated, and are designed to handle high volumes of passengers efficiently. They are particularly useful in densely populated urban areas where traffic congestion is a significant issue.
Delhi and Kolkata are two of the largest metropolitan cities in India, and both have well-developed metro systems. The Delhi Metro, which began operations in 2002, is one of the largest and fastest-growing metro systems in the world. It has significantly improved public transportation in the city and serves as a model for other cities in India. The Kolkata Metro, which started operations in 1984, is the oldest metro system in India and has been instrumental in providing efficient transportation to the residents of Kolkata.
Other major cities in India, such as Mumbai, Chennai, and Hyderabad, are also in the process of developing or expanding their metro systems. However, as of the time of this question, Delhi and Kolkata are the only two cities with fully operational metro systems.
It is important to note that while many cities in India have plans for metro systems, the actual implementation and operation of these systems can take several years. Therefore, it is crucial to stay updated with the latest developments in urban infrastructure and transportation systems in India.