What is a long distance run?[[in track[]]?

If you are referring to horse racing, as the category indicates…

A long distance run is sometimes referred to as a steeple chase.

The longest horse race in the world was probably the Great American Horse Race…

During the Bicentennial summer of 1976, two journalists traveled with and documented the longest horse race in history – - New York to California in 100 days.

Source(s):

http://en.wikipedia.org/wiki/steeplechas…
steeplechase

http://www.amazon.com/great-american-hor…
Longest horse race in the world?

http://www.zebranaps.com
article resource site