Do you think rail gets built overnight? We won't see the effects of this funding for a decade or more. Walkability has to do with local zoning laws above all else. The federal government doesn't have the jurisdiction to force that into law, and it would be detrimental to blanket that across everywhere in the US. Walkability needs to be focused upon in cities, which is already happening.
I think you're quite biased here and you should really take a step back and look at the facts.