Another barrier is that here in the United States we have introduced a series of strength or safety standards, referred to as Part 238. Most of this equipment is built to an international UIC standard, which is substantially less than the U.S. standards, but in order to build to U.S. standards it requires considerable engineering redesign of the equipment in order to bring it on board in the U.S.
I'll throw in another thought here. Currently there's a lot of activity regarding crash energy management. It substantially changes the design of the equipment. The U.S. is putting thresholds up there that are some of the highest in the world, and that creates another barrier to the introduction of these already standard designs from both Asia and the U.S.