The lone ranger and Tonto were riding across the prairie one day and came across railroad tracks.
The lone ranger got off, put his ear on the tracks. after a moment he got up and said "Train Come".
Tonto said "How know"?
the Lone Ranger said that he could hear it in the rail .... sound travels much faster and further in the steel than in the air.
After riding on for a while they came to animal tracks trecking across the prairie. Tonto stops his horse and gets off, pt his ear on the tracks. After a moment he got up and said "Buffalo Come!"
The lone ranger says "How Know?"
Tonto says "Ear wet!"