One of two in a historic 1869 Utah meeting (4,5)
I believe the answer is:
iron horse
'one of two in a historic 1869 utah meeting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iron horse that I've seen before include "Old name for locomotive" , "film once in America!" , "Steam locomotive" , "An invention of the steam age" , "Train leader" .)