Building and Powering AAR A Trucks

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Building and Powering AAR A Trucks

by Daris A Nevil

5 March 2015

A little over 12 years ago I purchased a set of castings from MDM Locomotive Works to build a pair of AAR A trucks. I am really impressed with this kit, as it includes everything except the motors. It includes all screws and hardware, flame cut parts for brakes, wheels, axle material, even a set of Clippard air brake cylinders. It's really a shame that no one has taken over Jim Murray's fine business.

I have worked on this kit off and on since I purchased it. I had never quite been sure how I was going to power the trucks. I wanted electric driven axles, as I know how to design and wire the electric circuits. Recently (well, about a year ago), I decided to put more effort into constructing the trucks, partially in hopes that an epiphany would come to regarding what motors to use and how to mount them.

This plan has worked. I am nearing completing of the trucks, including the electric motor drives. The motor design is simple but effective. This article will illustrate the method and materials I used.

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