Is that right? Are these grain silos? I think so. Hey, give me a break, I grew up in California. I think they're even owned by ADM, that huge agro company that sponsors public radio a lot. Anyway, these are along the same road as the train yard (makes sense, no?), and I love them. The range of imagery in this artwork is really interesting, and the artist did so much with only a few colors.
Oh, and thank you very much for my lovely composition skills that allowed the word "cookies" to show on the bottom left (you'll have to click on the picture to see the larger version). There is a coffee shop there with a cookie shop inside. They're really good, too. And she always gives you a free sample cookie. Like, a WHOLE cookie, not just a cut up crumb as big as your pinky.
Aha! I have been informed that these are grain ELEVATORS (thank you, Jilly). Who knew grain needed elevators? Why can't they take the stairs? And yes, Chris, this was a commissioned artwork, one of the largest in the Twin Cities, it turns out.