How is the Indian rail network one of the largest and busiest networks in the world?

The Indian rail network is one of the largest and busiest networks in the world, transporting over 18 million passengers and more than 2 million tonnes of freight daily. It is the world's largest employer, with more than 1.4 million employees. The railways traverse the length and breadth of the country, covering 7,137 stations over a total route length of more than 66,030 kilometres.