It is a generative sculpture. The long strips of LED lights fixed to the side of the train are not pre-programmed, but are triggered by sensors on the train that measure light, temperature, sound and speed and are constantly remixing live.
What I discovered was that I was taking a different kind of picture than I'd taken before. I was emphasizing the foreground and leaving the background a little out of focus. It's an approach I'd never used before and found that I returned to a half dozen times that day.