Something didn't seem quite right...so I went searching. 

http://waynesword.palomar.edu/montph11.htm

http://www.steveprocko.com/steveprockocom/new/00253.html

3 rails on one side, one for bracing on the other lower side....but then every once in a while, you make an 'X'.  Would seem like for extra bracing, but they are not put at any pressure points in the fence....more or less randomly put in...weird :?  :???:

Think I will stick with a split rail fence.  Those Wyoming fences look like a 2-3 man operation.