Manny why don't you post a video so we can hear it for ourselves? I agree with Don, there shouldn't be a buzz on DC. If you put a capacitor across the DC output of the rectifier, it will eliminate the 60Hz ripple. Beyond that, you might be hearing gears meshing (is the armature thrust play set correctly?) or the copper-carbon brushes clicking as they ride over the commutator segments. Lionel locos use a flat, pancake-style commutator like a slot car, as opposed to the radial drum-style commutators used on "scale" locos. Does it make the buzzing sound in both directions? Maybe one commutator segment isn't flush and the brushes are snagging on it? Just thinking aloud here.
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