I'm on one of my local transit authority's regional rail (commuter) lines, and am struck as I always am when I take such a trip by how little transit oriented development there is around the transit. Now it's certainly possible that in many cases bad land use is actually market driven. But my guess is that in many cases, as it is generally, it's actually illegal to build any such development. So you have park and ride lots next to the stations.
I'm certainly for building new SUPERTRAINS, but it's also true that we could provide more access to alternative transit if we improved stupid zoning and land use laws.