"Geared Steam Locos" excerpt from Sunday River Productions

This anthology brings you three types of gritty geared locomotives running on six different logging lines. Complete video is available at Geared Steam Locos: 6 Logging Lines www.sundayriver....
With their ability to negotiate less than perfect track work and climb steep grades, geared steam locomotives were generally used where tight curves restricted the use of conventional rigid frame steam locos and engine speed was not a factor.
Animations show the types of geared motive power that enabled Shays, Climaxes and Heislers to muscle up steep grades of 5-6% that would have defeated conventional steam.