I was surprised to learn only a couple dozen of these dozers have ever been manufactured. Each one is 1/3 the mass of a 747. I could've sworn this is what the

I was surprised to learn only a couple dozen of these dozers have ever been manufactured. Each one is 1/3 the mass of a 747. I could've sworn this is what they use to push lava around during initial stages of construction on the Big Island of Hawaii. Pretty sure it's only a little brother version, though ;)