How did the londan underground railway become a huge sucess? explain?

London Underground Railway was a huge success because of the following reasons I'm telling you ---
1. The population of London increased dramatically because many people migrated from villages to the city in search of work.
2. People of the city were accommodated outside the city in family cottages, while the industrial places where they worked were located on the inside of London.
3. Some form of transport was needed so that people could commute from home to work and back home, and the Underground Railway helped in that a lot, because it was the only mode of transport which carried a large number of people in a short span of time.
4. Although the railway was discouraged earlier because people complained of suffocation, it became a huge success because it was the only way of connecting their homes with their workplace.
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