http://www.guardian.co.uk/travel/gallery/2013/jan/09/150-years-london-underground-pictures

Any visitor and tourist will tell you, riding on the Underground is really something special . No, its not a rollercoaster or amusement park ride but the ability to move easily around town - from work, home, shops, restaurants, wherever - makes it something special. Especially haven experienced the chaotic Lagos transportation system of danfos and okadas tearing down the road median, pedestrians stumbling across major highways in high heels, weaving hawkers and siren-blaring political leaders and military men.
The Tube - a triumph in mass transportation - surely is a breath of fresh air and should serve as an inspiration.
So congratulations to the people of London!