What are trains really really good for? http://farm7.staticflickr.com/6157/6222848413_5832cfcfe5_z.jpg
Better tracks mean faster and more armaments get shipped where needed. Which means you need fewer to control larger areas. Let alone the support needed is simplified.
Alleviate freeway congestion, save fuel, cut down on the loss of life in accidents, cut down on pollution,
and about a dozen other things Cons don't give a rats ash about.
You ever drive in China? Taking the train can save your life.