What is the most expensive underground/metro/tube system to travel on in the world?

Question

What is the most expensive underground/metro/tube system to travel on in the world?

Answer 1

Got to be the Tube in London - everything else is the dearest about - why not the Tube?

Answer 2

I don't know but BART in the San Francisco area is expensive

Answer 3

London is easilly the most expensive underground network in the world however you can by an all day fare for around £7 which is quite good value

Answer 4

to salleynev: £3 will become £4 in january

Answer 5

London is far more expensive than Paris or New York - can't comment on Canada's though.

Answer 6

London's is ridiculously expensive. £3 for a single journey in Zone 1 is absolutely disgraceful.