So comparing a nation that has never used trains for distribution to one that looses the trains it uses massively for distribution? Yep, that's a fair comparison. There aren't enough trucks in the U.S. to move the volume. People would start to starve in that week. Look what happened with New Orleans. Imagine if New York went without food for a week. Civilization might not end, but it would be one hell of a disaster. Ever hear the saying "Every society is 3 meals away from revolution"?
Ordinary people all over South Texas during Ike, Rita and Katrina went without 3+ regular meals and didn't revolt because the average American has more integrity than the common looter. I was down there for part of it and I knew plenty of ppl who kept their shit together.