Explanations:Urban transportation systems are crucial for managing the high population density and traffic congestion in major Indian cities. Among the options provided, Mumbai stands out as the city that has both a metro rail and a monorail system. The metro rail system in Mumbai is a relatively recent addition, with the first phase of the metro opening in 2014. The monorail system, on the other hand, has been operational since 2014 and serves as a supplementary mode of public transportation.
The metro rail system in Mumbai is part of a larger plan to improve public transportation and reduce traffic congestion. It includes several lines that connect different parts of the city, providing a fast and efficient way for commuters to travel. The monorail, while not as extensive as the metro, serves a specific corridor and complements the overall transportation network.
Delhi and Kolkata, while having well-developed metro rail systems, do not have monorail systems. Delhi's metro rail system is one of the largest in the world, but it does not include a monorail. Similarly, Kolkata's metro rail system, which began operations in 2014, does not include a monorail component.
Understanding the transportation infrastructure of major cities is important for competitive exams and general knowledge. It is essential to know which cities have which types of transportation systems, as this can impact urban planning, economic development, and the daily lives of residents. In the context of this question, Mumbai is the only city that meets the criteria of having both a metro rail and a monorail system.