It seems a bit implausible on the surface, but cars around the nation are piling up at holding lots not for a lack of customers, but instead because of a railcar shortage. Yea, we didn't see that one coming, either. However, it appears that rail transport capacity has been approaching its limit for quite some time now, and Hurricane Katrina had the same disruptive effect here as it had just about everywhere else. Fixing the problem could have all sorts of positive benefits, such as cheaper products, reduced highway traffic, and decreased energy usage. We won't be holding our breath, though.