There needs to be local public transportation infrastructure. This is where the US should be focusing efforts, no long-distance high-speed trains. It works in Europe because there are huge catchment areas (see population density) that funnel riders to regional hubs that are then connected with high speed trains. I don't think the first step to making rail work in the US is connecting metropolises with high-speed trains. Until there's a better local public transportation story, it's expensive and impractical once you arrive at your destination.