Servos
Sometimes known as stationary decoders these units are used to control points, signals, lighting and other fixed accessories. They do not have a variable speed motor drive capability.
- Solenoid motors are the most common method of point control including the Hornby, Peco and Seep ranges. Kato points also fall into this category but have dedicated decoders available from several manufacturers.
- Stall motors, often known as slow motion switch machines, of which the best known example is the Tortoise motor.
- Multifunction can be set to operate in more than one mode e.g. stall and/or solenoid.
- Servos are gaining in popularity as drives for many moving features.
- Specialist signalling decoders are rare and more complex in use. This category includes units that will automate signal operation independently from the control system.