Trains and planes and others are a bit wonky for this chart. If I needed to take get to work, train and plane immediately resort to walking the entire way (unless get in a car, on a bike, fall just after). So while traveling across the country for a trip may be convenient on a train... Wait, unless I only have the weekend or a short work trip/vacation, because then it would take to much time and be inconvenient. Tried to find an example. Travel to Las Vegas from Nashville. Plane, ~3 hour flight plus let's say 2 hour travel and airport bs. So 5 hours there, 5 back. Driving: 26 hours (each way). Walking: Death by dehydration in desert. Train: not even listed as there was no routes.