I set my camera on a tripod, with manual focus and manual settings. It is a 20" long exposure, so first you have to make sure you get the starts right. Once I had what I though were the right settings to capture the stars, I set up the angle I wanted and because it was pitch dark, I had to "paint" the train with the light from my iphone. So, basically, it is a long exposure of the stars and the train is lit by the led light of my iphone.