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I'm not sure about Athearn's break in procedure, but most manufacturers do have a procedure of some sort, usually included in the instructions. Basically, you want to follow those instructions, if possible. The recommended procedure for one of my P2K diesel locomotives is to operate at varying speeds, starting and stopping frequently while running in both forward and reverse for an hour or so. The main purpose of this is to "seat" the motor brushes to improve operation for the life of the locomotive (or until the brushes need to be replaced). The procedure for an Athearn diesel locomotive like yours should not be very different.
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