[darkangelism]

it wouldnt be a 100 billion it would be a lot more maybe 10 or 100 times as much, and we have rail network, but for it to work for commuting it needs lots of stops like a subway system. and the ridership would be very low in lots of the country. take oklahoma for example its population density is only 50 people per square mile and an effective mass transit system would need a stop every mile at least, even oklahoma city only has a density of 871 people per square mile compare that to the density of NYC which is 21,000 per square mile, the cost of running the system would be more expensive then cars, and the raw material cost would be huge.