Well, glad to see some interest in this concept. And, really, think upon this: I have a list of possible old west/cavalry versus indian gaming scenario options, probably thirty things on that list (whereever its hiding at the moment) but most people just play a simple shoot 'em up and call it quits.
But some for instances: range war cattle versus cattle, cattle versus sheep, cattle versus farmers; train robbery; bank robbery; war between two rival railroads heading for the same - and only available - pass; cattle rustling; river pirates; a game gone bad down at the gambling hall - or on board the river boat. So many more options than the simple gun fight. This is why I have figures for the period, the extraordinary diversity of possible scenarios. Oh, can't forget, robbing the noon stage - about two thirty in the afternoon (late, you know). :D
And that's before we bring the cavalry and the plains indians - or the Apaches - or the Mexican Federales along the border, etc.
There you go, the Railroad comes to Dead Man's Gulch...
:)