This photograph was taken in Paris subway, playing with white balance of my camera and I increased contrast in post-processing.
I would to participate to this contest in order to support.
In France, and especially here in Paris, photography is officially banned in subway, for a very long time, except with an authorization of the company which manages the network.....
So we have to be discrete to take pictures and, for the moment, nobody said me to go away.
Actually, when I decide to take some photos in subway, I don't take tripod with me.
I'm often disappointed because, in my opinion, subway is a great place for inspiration : impressive architecture, fast movements, dark and high lights, and people who can be often so common (like me) or sometimes so original.
I don't know NYC subway, but I think your subway looks like ours.