Abstract :
Most of us have seen trains, but there are many, many people in the world who have never really seen a railroad, who have never seen it with their mind´s eye, never caught the meaning of the thing, and never understood just what it is and does and means in the lives of all of us on this American continent. A curious sort of blind spot afflicts us toward things to which we are accustomed. We see them around us with our physical eye, but those that were here before we were, we are pretty likely to take as a matter of course — to take them for granted as we take water and air and other indispensables of life.
