London Tube

With 420km of network, Shanghai's metro overtook the London Underground, which has a total of 402km. But the rate of expansion is more impressive: the first line was constructed in only 1995 and it is still expanding.

The London bus network carries over twice the number of people as the underground network. "But with Britain's new coalition government preparing comprehensive budget cuts, the future of London's transport network is uncertain."

A new report shows that overcrowding on the London Tube is hardening transit takers, turning them ruthless and selfish. Even pregnant riders are left to fend for themselves.