Wikipedia's "Light rail" (http://en.wikipedia.org/wiki/Light_rail http://en.wikipedia.org/wiki/Light_rail) article has some interesting numbers on the cost of l

Wikipedia's "Light rail" (http://en.wikipedia.org/wiki/Light_rail http://en.wikipedia.org/wiki/Light_rail) article has some interesting numbers on the cost of light-rail construction: Over the U.S. as a whole, excluding Seattle, new light rail construction costs average about $35 million per mile. By comparison, a freeway lane expansion typically costs $20 million per lane mile for two directions.