It's Oslo T-bane (that's a sort of collective term for trams and underground stuff). I used some noise reduction which I think was a mistake, as dirt = noise = dirt. It's pretty much a snapshot that I took and entered just because it strikes me as dirty.
The shot I now regret not taking would have entailed lying on my belly and getting feet, hamburger cartons and all the other ghastly stuff that gets there, as well as including a bit of the aisle.
I think the whole angle is wrong. I think this would be nice if you zoomed out and got more of the train with a couple of people slightly out of focus but had the focus on the dirt. Just my opinion. I gave it a 5.
I gave this a 6. I think it might be better with the seats cropped off. The color there distracts from the dirt subject. And with the seats gone, the diagonal aspect of the shot isn't such a problem. Granted, you can't tell this is a train without the seats, but you sure can tell it's dirty. And I like the color tones of the metal.