From a nice hike from Brienz (1857 ft) up to the Brienzer Rothorn (7362 ft). The Brienzer Rothorn cog railway is operated by steam locomotives. Most of the steam locomotives were built after 1970. See http://en.wikipedia.org/wiki/Brienz_Rothorn_Bahn
Here is the same train twice shown a little bit above of the first passing loop at Geldried, 3343 ft above sea level.