The development of suburbs as a part of the drive to decongest London led to the extension of the city beyond the range where people could walk to work. Though these suburbs had been built, the people could not be persuaded to leave the city and stay far away from their places of work in the absence of some form of public transport. The Underground railway was constructed to solve this housing problem.
The development of the Underground was criticised because underground travelling was considered risky. Many felt that it added to the mess and unhygienic conditions of the city. Also, to clear the path for the construction of the Underground, a number of houses were destroyed. This led to the displacement of a great number of London poor.