Indian Railways is cited as a real-world example of which market structure?

1. Monopoly is a single seller producing for many buyers, with an extremely differentiated product and no close substitutes. 2. Indian Railways is given as the example of monopoly. 3. Shampoo manufacturers illustrate monopolistic competition and telecom illustrates oligopoly, so those are ruled out. 4. Therefore monopoly is correct. _Source: ICAI BoS CA Foundation Paper 4 Business Economics, Ch 4 Unit I "Meaning and Types of Markets", p.4_