*Lock and Load boys, we've got an argument to shoot down*
I will disassemble this piece by piece.
The ark was 450 long, and made entirely of wood. The longest wooden ship in the world, outside of the mythical Ark, is just over 300 feet long. Do you know where that is? It sank, because constant stressing and flexing of the wooden hall from the waves poured sea-water into the hull. It had to be constantly pumped out.
http://en.wikipedia.org/wiki/Wyoming_%28schooner%29
It is indeed 1518750 cubic feet. That isn't 522 Boxcars though, it's only about 230 boxcars.
A Boxcar.
http://www.freefoto.com/images/25/24/25_24_17---Railroad-Boxcar_web.jpg
Typical volume of a Boxcar, about 5200 - 6600 feet cube.
http://www.csx.com/?fuseaction=customers.search_car&n=Typical%20Boxcar%20Dimensions
Volume of Creationist Boxcars? ~2669 Feet cube, according to CARM.
http://www.carm.org/questions/about-bible/could-noahs-ark-hold-all-animals
I could not find any boxcars this size. This is two to three times smaller than typical boxcars.
There are millions of species of organisms on Earth, mostly insects (about 90%).
http://en.wikipedia.org/wiki/Insect
There are over 5000 mammals alone, not including extinct ones. 10,000 living species of bird, 8900 of reptiles, 6200 amphibians, 30,000 fish, half of which are *freshwater* fish which cannot survive in a salt-water environment.
So, not only do you have to fit two of all these animals onboard the Ark, you have to provide both food & water. The first casualty of floods is drinking water. Even if animals are roughly the same size as sheep, you're packing 240 sheep (again, according to CARM) into a boxcar the size of your bedroom, and then you're stacking these micro boxcars ontop of each other (notice how surface area is conveniently left out of Creationist equations). No sane person would subject animals to either of these conditions. The containers on bottom would be centers of disgust and disease.
These animals alone would take up *far* more than 1\3 of the space. CARM reports about 60% of the space. They are using 1\3 size boxcars and fitting in a full-size boxcar worth of sheep into them. That alone puts their numbers at 180% of space. They don't include fish either (which they need to), or extinct animals, which there are a lot, nor water!
Considering average age of a person at that time was about 30 years of age, you're talking several generations of people to build that. Noah wasn't told to build it, but Noah's great great great great great grandfather was. He inherited a nearly finished ship.
"For those that think that this is just a story written by illiterate shepherds, I have 2 more questions."
STRAWMAN.
"The Ark is a 1:6 ratio. the same ratio used on ships today..."
And has been used on boats throughout history. The Ark wasn't the first.
"There was no America or Australia then."
Yes, there was. The current continents formed long before Noah's time. The only possible way for those animals to cross would be through the Alaskan-Russian ice-bridge, which is unpredictable and sporadic. You're talking tropical animals waiting in the dead of winter to cross that. Would. Not. Happen. They would all die by then.
Which of course, means what happened to all these creatures that require specialized habitats to begin with?
Non of this matters anyway, because the flood is a physical impossibility.