On a Lionel post war motor, the power goes through the armature coils and then through the field coils. They are in series. To reverse the motors direction, reverse the wires to the brushes, without reversing the power to the field. In most postwar motors, one field wire is grounded to the motor frame, so reversing the brushes or the way to go. There are a few post war motors with double wound fields. They will not have three position e units and would be connected differently to reverse them. In Rob's drawing, the red wire would be coming from the current collector (center rail) and the black wire would go off to the field connection. I do not specifically recall the 628, bur frequently Lionel put a third lug on the brush plate for the field lead to connect to.
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