The main problem is "Dinero" MONEY. Railroads are great alternative but in a landscape where a small bridge is extremely difficult to construct, how can we imagine railroads? It is possible, if we have the financing like Switzerland. I once went from Dhangadhi to Baitadi and man was I afraid. I had window seat and most of the way when i looked down, there was no road...all i could see was gorge...and river way down. Our lives were on the driver's hand on that narrow road. When another bus came from opposite side, big problem, need to wait round the corner and let other pass... dangerous