ATSF 1158 class
The Atchison, Topeka and Santa Fe Railway's 1158 class comprised two 2-6-6-2 articulated steam locomotives built in 1910 by the Baldwin Locomotive Works. They were built with flexible, jointed boilers, an experiment confined to the Santa Fe; the railroad considered it successful enough to build four of the later 3300 class locomotives with flexible boilers, but both classes were scrapped in the 1920s.
- Werkema, Evan (1996). "Santa Fe All-Time Steam Roster". ATSF.Railfan.net. Retrieved 2008-01-16.