Winding engine

A winding engine is a stationary engine used to control a cable, for example to power a mining hoist at a pit head. Electric hoist controllers that have replaced proper winding engines in modern mining but use electric motors are also traditionally referred to as winding engines.

Most proper winding engines have been stationary steam engines. They differ from most other stationary steam engines in that, like a steam locomotive, they need to be able to stop frequently and also reverse. This requires more complex valve gear and other controls than are needed on engines used in mills or to drive pumps.

From http://en.wikipedia.org/