Extending NYC's subway system costs >$1.5 billion per mile, vs. Madrid's $0.05 bn/mi: "sobering" stats from @JuliaManhattan at #RPA2017pic.twitter.com/Vc3Aus0KLA – at Grand Hyatt New York
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Haven't seen extension-only ridership stats, but cities have a narrower range of fares, from ~$1.60 in Madrid to $3 in London (single zone)
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