What: Tehachapi Loop, a railroad loop where trains pass over themselves in the process of gaining or losing elevation. The loop is near Hwy 58 between Bakersfield and Tehachapi, CA. It is about a mile from Keene, CA, where the President dedicated a national monument on Oct 8, 2012, to Cesar Chavez, founder of the UFW.
Here's the entire picture with the horse:
I think this explains why wagga said the horse's name is NOT Chicken Little. The horse is standing at the edge of the "trench" where the trains head underneath the loop crossover on their way west to Bakersfield.