The American train journey has always had a strong hold on the imagination. Ever-changing landscapes pass by on the other side of the glass, from the primeval-looking Joshua trees of the Mojave Desert and the saw-toothed peaks of the Rocky Mountains to the pounding surf of the Pacific and Atlantic coasts. And in these ecologically-conscious times, rail travel offers a peace of mind that cannot be matched by a stressful domestic flight.Now in its eighth...