The hobby of model railroading, like many hobbies, have a number of unique terms that are sometimes difficult to understand for people new to the hobby. Below is a short listing of model railroad terms: A Accessory: a non-essential electric device. Switch motors, signals, and block switches are just a few examples. Air brush: a device which applies paint using compressed air. Like a spray can, but with a steady supply of air and a much finer mist. Alternating Current: Electricity that switches direction of travel, typically 60 times per second (60Hz) in the US. Used mostly in O scale, 3 rail trains. Amperage: a unit of measurement for the amount of electrical current. Analog: Control of trains without digital signals. Either through AC or DC electric current. B Backdrop: a panel that is meant to give the illusion of distance on a mode railroad. This can be a basic sky-blue board, painted scenes, photographs stitched toge...