[QUOTE=danceronice;5202133]
And I would love to hear the justification of the simulation creators for including Big Brown, Barbaro, and Smarty Jones. (Smarty Jones? Really? And is that Big Brown with or without steroids?)[/QUOTE]
Popularity. Pure and simple. All the horse named are either very well known to modern fans or in the case of Seabiscuit and Citation “those old horses”. More odd is the inclusion of Affirmed and Cigar, both of which are likely only marginally known at best to fans of Big Brown.
Zenyatta, Seabiscuit, Cigar, Rachel Alexandra, Big Brown, Barbaro, Ruffian, Smarty Jones, Citation and Affirmed.
I think the old timers would love to see someday up in that big track in the sky an afternoon race of Stymie, Exterminator, Man O’War, Colin, Native Dancer, Citation and heck lets toss in John Henry and Silky Sullivan 
What always struck me about the great Colin was his trainer, James G. Rowe, Sr., and his only wish to have put on his tombstone: “he trained Colin”.
That alone truly said a lot about Colin as Rowe had been the US leading jockey for 1871 -1873, then got into the training side. He also trained KY Derby winners Hindoo and Regret as well as Miss Woodford, Sysonby, Peter Pan and Whisk Broom II. He was one of the greatest trainers in US history.