Your answers would be:
1). They have a lot of vast land, meaning that they have an extremely large amount of land, which makes it easy to place down rails
2). The land is high in population, which means that people will be interested in the railway network.
The dense railway network is found in the great plains of India because they have a lot of vast land, meaning that they have an extremely large amount of land, which makes it easy to place down rails, and the land is high in population, which means that people will be interested in the railway network.
Definitions:
Railway:
A transportation system that uses trains, the trains will be travelling on train tracks.
Great Plains:
The great plains in India is land that is flat.
Explanation:
The dense railway network in India is very big, and this railway network is very important to them because it is very convenient in the land they're in. The first reason why there is a dense railway network in India is because  they have a lot of vast land, meaning that they have an extremely large amount of land, which makes it easy to place down rails. A flat land makes it easy to put down railroads because there is nothing that curves in the land in which they would have to even out, the land is pretty much already evened out for them, which makes it easy for the people who are putting down the tracks a lot easier. That's why in India there is a lot of railways in the plains, since it's very easy to place the rails down, and gives a great route for the trains to pass by on. Another reason why there is a dense railway network in India is because the land is high in population, which means that people will be interested in the railway network. If there is a lot of people, then there will be in need of a source of transportation. Since not everyone has a car to travel on, they need to depend on something else to support their transporting needs, and walking is not an option where going on long distances. This railway network in India transports thousand of people around India, and this is a really good business because a lot of people rely on it. That's why you see places that has a high population density wit ha lot of railway networks, it's very convenient and will transport A LOT of people in a given amount of time.
-Julie
