Some great advice already from some very talented photographers! I can definitely see your fascination with the subject--it really lends itself to your Art Deco vibe, and puts me in mind of a train on the Chicago El (though one whose journey is about to come to an abrupt halt!) That said, one thing I might add is that you're probably fighting the light--I can imagine at a different time of day (or even day of the year) this very interesting structure would really pop against a dark sky and mountain range. Backlit as it is, it's really going to be tough to get any kind of "separation" in the frame that clues us in on what you intend the subject to be.
Otherwise, I'll plump for the composition of the first offering over the last...that "kink" as the structure gains elevation adds a bit of dynamism to the image for me (see "trains," above)--in fact, I might go back with a little longer lens so see if I could emphasize its curve in space...a bit more compression and shallower DOF might lift a really neat focal point out of the clutter.