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USA
December 6th, 1968
Denver & Rio Grande Western Railroad's Alamosa–Durango Line (3" narrow gauge) in southwest Colorado
Several fragments of this route survive as tourist lines, some of which are the best in the country.
I should note that technically, steam has never officially died completely here. The Union Pacific has had a steam locomotive that has never officially retired from its roster and still runs, and the Strasburg Rail Road, which still runs under its original charter from the 1830s, primarily uses steam, and on occasion they pull revenue freight for one customer on its line.
Steam locomotives pulling revenue freight is among the rarest sights one can see on the rails.