For reference, this is the California great wall. No kidding, this thing is absolutely massive. It has piles anchoring it into the ground every few feet The cars and cranes on the image give you a clue of just how massive it really is. That thing it at least 2 feet thick. Given just how much concrete is being poured into that wall and the anchoring piles, they are probably at least halfway to the quantity that would be required for a viaduct. It was built to prevent merchandise trains from intruding onto the HSR track. It runs north of Madera and is at least 5kms long.
Note: Google Earth has a new version and full screen does not seem to work with this new version, so I had to crop the top and bottom much more than I usually need to.