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



Answers:
to salleynev: £3 will become £4 in january
London is far more expensive than Paris or New York - can't comment on Canada's though.
London's is ridiculously expensive. £3 for a single journey in Zone 1 is absolutely disgraceful.
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
Got to be the Tube in London - everything else is the dearest about - why not the Tube?
I don't know but BART in the San Francisco area is expensive

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