NYC's network isn't as clear-cut as Tokyo Metro's, so it's hard to look at every line--but it's obvious non-Manhattan lines kill the averagepic.twitter.com/mQSthrfSyD
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8 years after its opening in 2006, daily ridership had finally reached 64,385...but it was supposed to hit 120,000 within the first year!pic.twitter.com/QqTHEfeQAW
So, the Imazatosuji Line's rider density is currently 8,701 per mile--too low! If it had hit its target, it would be 16,216 per mile...
...so, with that in mind, I think we can make a good guess where the break-even point is for a generic subway line: roughly 15,000 per mile
A subway line with higher passenger density than this should (all else being equal) be able to operate at a profit. If it can't...?
...time to start auditing!
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