Ingsy you are right, the yellow line is really important in the picture. It's a big leading line, our eyes follow it immediately up to infinity. That's the reason I gave it a big saturation boost and added some luminosity to it. Without it, the picture would have been to much blue.
To help your shot, I'd select a smaller aperture (at F8), the blur portion of the sidewalk is a bit distracting. Also I'd crop it tighter, there is too much wasted space on the bottom right part of the picture. Our eyes aren't going straight to the track because there's lots of room to look around. Lastly I'd tweak the white balance a bit more to the blue side, to give it a colder feel.
Hope I helped a bit 
















