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London has a successful underground railways due to its advantage.They were cheaper.People can now come from outer London to main city for work.Women use this for going to opera and programs.Transported goods .It also give many disadvantges but it became utiltiy in future.
In  London underground railways are success because nowadays the population is incresing ,so the need for land is also increasing.So underground railway will be helpful in reducing this problem.Also they are cheaper.