Mumbai, the financial centre of the country as well as the famous film city of India, is the fourth most populous cities in the world. This wonderful metropolitan city comprises of seven amazing islands and edged by the coastline of the Arabian Sea. The city houses some of the best locations in the country. Along with that it is the soul centre of the Bollywood industry. As a result of all these attractions, the city got the tag of the most populous city in India. Keeping all these factors in mind, in recent times to control the rush of crowd, an underground metro construction project is taken into hand which is presently moving under construction. It is going to be a rapid transit system. The basic reason behind designing this metro route is to reduce traffic congestion in the city. The expected duration of this construction is expected to be a 15-year period. Being one of the busiest and the most populous city of India, this historical metro city neither has enough space to expand the railway, nor the road. Everything seems to be very congested from last few years with the booming Bollywood industry as well the finance city.With the introduction of the metro rail, a huge change will be reflected on the existing transportation system. It is expected to be a very crucial project and has got the required response from all over the country. It will bring the needed mobility for Mumbai and will also help to bring back the lost fame of the city.The loan granted by JICA is expected to go a long way and it will address the major urban problems related to congestion in Mumbai. Being a metro city Mumbai remains busy for the day and night equally with overcrowded local trains. But on completion of this project, the city dwellers will considerably get a bit relaxation from overcrowd. The project of Mumbai Metro-3 will have 26 underground stations which will start running from Cuffe Parade. The track will pass through Worli, Bandra, and the domestic and international airports and finally end at SEEPZ near Jogeshwari. The ongoing metro project will also offer interchange facilities to the passengers with Central Railway at Chhatrapati Shivaji Terminus and Western Railway at Churchgate along with Mumbai Central and Mahalaxmi.However, the next project of Metro-1 will provide interchange facilities at Marol Naka and Metro-2 will provide at Bandra-Kurla Complex.