Within stationary steam engines we can sub-classify into two main types:
- Steam engines with frequent stops and changes of direction: rolling rolls, steam mules, marine engines and similar applications.
- Steam engines that give power. These types of engines rarely stop and do not need changes of direction. This type includes the engines that are used in thermal power plants, nuclear power plants and those that were used in pumping stations, mills, factories and to power trains and trams before the widespread use of electricity.
Steam mules are technically stationary engines, although they are mounted on skids and can be transported. They are designed for the wood industry and can be transported in each place. Once secured by wire to a tree in the desired location, the machine moves to the anchor point to which it is stuck.
Steam mules were also used to move winches on commercial sailboats and sailing yachts.
A portable motor is a stationary motor mounted on wheels. As its name suggests, this type of engine can be transported in each place, instead of being fixed in a certain location.