When I moved to New York in 2011, I found myself staring at the tiles on the subway station walls while I was waiting for next train to arrive.
"I wonder how old these are? Wow, they're hand painted! What font is that?"
I did a bit of digging on the internet and I couldn't come up with an answer to that last question (see bottom of this page for more info). Furthermore, I couldn't believe that somebody hadn't tried to recreate the font.
So, after many months of taking photos and kicking around the idea, I finally decided to try to do it myself.
UPDATE: You may now purchase this font for personal or commercial use at www.nycsubwayfont.com