I've wanted this for a very, very, very long time.
A modern and fast moving inter-rail system in the US? Cutting my travel time between New York and Chicago, or Milwaukee to just a few hours? Perhaps reducing my out of pocket travel costs and carbon emissions associated with car or airplane travel? Relieve congestion in the air and on the ground? This will make my grandmother love a little more. Many of my planner geek friends and I have long lamented the fact of how easy it is to travel through Europe because of high speed train service, than it is in the US. Our reliance on cars has been prohibitive for a high-speed rail system to develop.
The Europification of the United States of America. I think we're finally growing up, defining a society that can live sustainably. My carbon footprint is starting to look a lot cuter.