Why doesn't New York City have an H train?

[jtbell]

Even if you're not a New Yorker, you probably know about the A train. And if you're a New Yorker or have visited New York, you may also know about the B, C, D, E, F, G, J, L, M, N, Q, R, S, V, W and Z trains. But you never hear about the H train. Have you ever wondered where it goes?

http://www.newyorker.com/culture/cover-story/cover-story-2017-08-07

 

[fresh_42]

And the $\mathcal{i}\,$line is missing, because one big Apple refused sponsorship for the other big apple?

 

[jtbell]

Probably because it would be too easy to confuse with this "one".

https://en.wikipedia.org/wiki/1_(New_York_City_Subway_service)