That's the spirit!

I'm a great admirer of what the SVRR folks have accomplished with hard work and a positive attitude. Who else would go down to Central America and bring back the tenders and scrapped parts of the 250/251's? Too bad you guys didn't get started 10 years earlier when the other SV engines in South America really did exist.
Unfortunately, South America isn't frozen in time, and unlike the USA where nothing much got scrapped after 1970, preservation efforts in South America have been very limited. The G&Q was still busting up steam engine parts in 1991 to cast into replacement brake shoes. Lots of steam engines got turned into locally produced re-bar. If you've ever looked at typical South American building methods, you'd understand why a lot of steamers didn't make it.
What is amazing is that there are still some abandoned dumps of steam locomotives in Columbia, Chile, Bolivia, Brazil and other places. If someone could figure out how to get around the widespread "cultural patrimony" laws that prohibit the export of historical artifacts, there might actually be some engines that could be used in the US. Just not likely to be any second hand engines off of US roads is all.
To answer another question, the 123 is a Henschel 2-8-2. Both engines were moved out and put on display about 6 years ago, but had sat unused for many years before that. The photos look like they were taken about 10 - 15 years ago. Steam use ended in Cuzco in the early 1980's.