Why not connect the linkage to a turnout? Holes in the arm provide easy attachment points for push rods or wires that move back and forth moving whatever the linkage is connected to. Servos are available large and small but most share a common design: The rotating shaft accepts a lever arm which can be attached to extend in any direction. These are at the heart of the Radio-Control (RC) hobby They are used to steer or fly all RC models. All that is built into a small plastic box. ![]() ![]() The “ Servo Motor” is an assembly with a small electric motor, gears to rotate a shaft left and right, and an electronic circuit which moves the shaft to the precise angle it’s told to by an electronic signal.
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