These would have to me my favorites.

What makes this photo interesting is how the lights on the train contrast with the darkness all around. Yet, by keeping your distance, you have made the train even more of a focus. All in all, this is a very good study of light, especially how you captured the light shimmer of the tracks. In addition, your focal point is strong.

You have good angles in this photo which clearly define a focal point. The details of the train aren't all revealed because of the darkness and this adds to the solitary feeling evoked by the concentration of artificial light. The photo grabs you and makes you want to explore further down the walkway.

The shimmer of light on the tracks and the inclusion of the sky help give this photo a very soothing feeling. Here, only the tracks are presented as the inclusion of man-made objects. They provide a starck, focused contrast to the overall nature scene, yet tell a story of the day's end, when all is calm. When studying the photo more, I realize you made a smart choice in not centering the tracks in the composition. Keeping things a little off center aways seems to keep the eyes from darting right to the center (and not seeing the rest of the compostion).
Overall, you have a strong gasp of light, and how you can use it to your advantage in a composition. A possible next step might be to study focus and depth, much like you did in your closeup photo of the tracks. Shadows can also be quite interesting, but are always difficult to capture.
Good work!