The locomotive used in Tombstone was the "RENO" V&T #11. It was used on the Old Tucson studios facilities where they had a couple hundred feet of track. It was not under steam in the film because some genius thought a locomotive could be powered on compressed air. It was a disaster and the locomotive was severely damaged to install the compresser, pipes etc. The powerplant for the compressor was in a boxcar behind the tender.
The whole system had to be seen to be believed. But alas! as was discussed earlier in this thread, the RENO is just a prop.
Since the film, the RENO, as has been noted, burned. Although it was "rebuilt" for that fiasco "Wild Wild West" it is just about as pathetic a piece of equipment that one can imagine. Because....It is just a prop.
In spite of its horrid condition, the folks at Old Tucson think it is the finest example of restoration and display that one could possibly want, and they are ever so proud of it. If you look at a photo of it now, it looks sort of presentable, but then cameras are really blind in many ways. On close examination, structural parts are missing, there are holes in the boiler, accessories are a mess or worse, missing, and on and on.
Although it was the studios that originally acquired this type equipment back in the 1930s and 40s, I fear that what has happened to the Reno is the ultimate fate that would have been for all the railroad equipment they had. It is good they got it and saved them from the scrapper, but it was better when they eventually sold them. At least the EUREKA, INYO, DAYTON, V&T #25 and some others met a better fate.