I love trains and grey backgrounds. When you can get a little motion blur in there it's even better! Sometimes the gravel that is next to the train is extremely compelling as well and gives you a very tactile experience through the photo. You can imagine that they would be very hot during the summer time and nice and cool in the winter (possibly freezing!). In this photo you can see that there is a fairly large bend coming up which means the train probably is going pretty slow at this point but boy oh boy could you imagine how fast it could go when it gets on in the open?! Jeez one can only hope they are fortunate enough to see something like this.