A very well-rounded image. The first thing that the eye notices is the use of lines to draw us to the important parts of the image, from the traditional rule of thirds in the tracks and the axis of the model to the unconventional diagonals suggested by her arms.

Your contrast is superb; I particularly like images that utilize the entire tonal range. High-contrast images have always been a favorite of mine, and this is definitely contrasty. It's a little difficult to see much detail in the model, however. You may consider dodging her in a bit.

The mood overall is calm, playful, and hopeful. It feels like maybe there's something for her at the end of the track, but she's not in any hurry to get there. I might've liked it a bit more if you weren't so close to her, and made the scenery a larger part of the story, but the image still works fine as it is.

However, railroad track scenes like this aren't the most original. Explore ways to take what is a commonplace setting and make it unique to you. Working with a good model will naturally make more ideas apparent, and judging by your gallery, you already have a good knack for that. Your composition and technique are good, and I feel that with more exploration you'll be making wonderful scenes on these tracks.