if we are going to accommodate the grothe that i spoke about earlier with 100 million more americansover the next three decades or so, the growing economy that that represents, we simply have to invest in a variety of infrastructure. yes, we have to fix up our roads, yes we have to expend public transit, yes we have to keep our airports up to date. but the fact of the matter is in several corridors in the country, for example here in the northeast, there just isn't enough capacity in our air system or in our road system, and i don't know anyone who wants an airport built next to them or even a new runway added. and the roads systems, there are very limited places in congested corridors where those can be economically expanded. so it is going to take expansion of several different modes. i would argue it will also follow the rest of the developed world and investing in those corridors where it makes sense in high speed rail. >> i was very fortunate in december to be in both china and japan, have a chance to ride their high speed rail systems. i've had the opportunity to ride the europ