Perhaps they are looking at GE C23EMP models.
These are on a narrow guage line in Bolivia and also operate at high altitude.
https://www.youtube.com/watch?v=TvU3geaH4xE
Might look pretty good with Rio Grande-style speed lettering.
https://m.youtube.com/watch?v=JvSCJDzlH4M
Out of curiosity, what sort of diesels were being used? It would have been most interesting if they had a GA8 in Rio Grande colors (not likely, but I can daydream).
DURANGO, Colo. — Steam trains are running to Silverton again for the first time in six weeks after county officials reduced the fire danger restrictions. The first Durango & Silverton Narrow Gauge Railroad trains left Durango this morning w...
http://trn.trains.com/news/news-wire/2018/07/12-durango--silverton-resumes-steam-operations
Brian Schmidt, Editor, Classic Trains magazine
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