Nice game! Simple, yet fun and fits perfectly with the theme.
In my opinion, the strongest part is how intuitive and responsive it is, both in game an in menu. Best controls I've seen so far. In fact they're perfect and the single thing I could think of as maybe being improvement control-wise, is including right arrow as a selection key for alternative to the enter. The motion blur in the background feels so natural, that at first, I didn't even notice it! :) Plus the background graphics are absolutely gorgeous anyways. I'd like to see something as good in foreground too, while keeping it easily separable from the background. For example the locomotive itself could have a non-linear and clearly directional lighting. And the other foreground elements should also have a style that's consistent with that. Sure, they need to be clearly distinguishable with extreme speeds, so I understand why the water is so bright, but there's probably another solution that's equally readable and requires less saturation. As of sound, my ears crave for the sound effect, when a piece is placed, and especially, when misplaced - The camera shake makes me imagine it. :D I very much like the thump sound when changing between the menu options. That thump could even be louder. The sounds are an important part of the "juice". These are some ideas I had while playing and I share them with acknowledgement, that the game is totally cool as it is. I very much enjoyed playing it and wish You the best. Cheers!