High sun has nothing to do with having the sun at your back. High sun comes from the angle of the sun in the sky. In the summer months the sun rides higher in the sky. This creates distracting shadows on objects that wouldn't be there if the sun were at a lower angle.
A practical version of this is standing directly below a light on the ceiling facing down. You will have almost no shadow at all. If that light is on the opposite side of the room you will have a taller shadow.
If you asked 50 people how to tell if the sun is high almost all 50 people will tell you a different way to tell if the sun is high or not. A general rule is the sun is too high if an object's shadow is equal or shorter than it's height. Basically if you are 6 feet tall and your shadow is 6 feet long or shorter then you have high sun.
It is generally accepted that the sun is high in the sky from about 10:30 to 3:30 in the summer months.
There are ways around high sun such as getting elevation above the subject so the shadows created are not as noticible since the object that creates them covers them. Another technique would be to try shots where the train is very small in the setting.
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Duty is the most sublime word in our language. Do your duty in all things. You cannot do more. You should never wish to do less.- Robert E. Lee
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