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For those interested, the March '09 issue of Model Airplane News has an eight-page article entitled, "It's All About Servos" (the cover says "Servo Essentials - Everything You Need to Know"). It's an informative article that describes how servos are constructed, how they work, the difference between analog and digital servos and the advantages and disadvantages of each, etc. It also goes into how to hook servos up to controls for maximum effectiveness (while geared towards connecting them to model aircraft control surfaces, the basic principles behind the method is also applicable to trains). Worth reading imho.