While this freight train was passing through Aachen Hbf station (Germany), I took this same picture over and over again (exactly 20 times in total), between every two cars, in the hope of catching the gap. Turns out most versions are okay, but this one (#7) is my favorite.
The main point of this picture are the layers, of course. You've got the freight train with the motion blur, the class 111 with the open doors, and behind it Aachen's assistance work car which is always stationed there. In the foreground, you see the buffer of another class 111. Sadly, I don't have a wide-angle lens, so I couldn't get that locomotive on the picture in a meaningful fashion.
Additionally, you also got the engineer in his cab. He later closed the left door, but when the train departed, the right one was still open. Well, if the locomotive has no air-conditioning.
Another fun thing is the sticker on the locomotive. It advertises the 3-Löwen-Takt, an integrated timetable in the state of Baden-Württemberg. Aachen is nowhere near Baden-Württemberg, but instead in Northrhine-Westphalia. But because new EMUs that were ordered for the region haven't been delivered yet (but they finally all got official approval! Wohoo!), other regions had to help out with some locomotives. I think we have several from BaWü here, but I don't know their running numbers.
Oh, and yet another thing: The colored buffers on the tank cars. Those are crash buffers, which means that on collisions, they act as miniature crumple zones. They don't save people, but they are neat, cheap ways of reducing the damage done to a rail car in a low-speed collision, and they are standard feature on basically all new locomotives and many rail cars. They are also being retrofitted to older rail cars and locomotives.