Most of us who watch trains as a hobby, or latch on to them as artistic subjects, have a few favorite locations. Often, these spots are extolled for their convenience: They may be close to home, or on the way to work, or the geography means that the light is always perfect. Other spots, though, are discussed more reverently. Something about being in exactly that spot, as opposed to another one a quarter mile up or down the track, graduates train-watching from amusement t...