Comment by barretts

One important factor unmentioned so far: Federalism. The US has very strong state and municipal governments compared to France and Japan. In many cases, any one of the three can veto a project. A new commuter rail line under the Hudson River connecting NYC and NJ was begun in 2009 and NJ Gov Chris Christie killed it in 2010 (citing cost overruns), after $600m had already been spent.