I have several of these Weaver H10s 2-8-0's and they are all silent runners. I never have heard one scream like yours does. They have a 16:1 gearbox so are not "geared to the moon." The high gear ratio Pennsy brass models are the Williams K4's, which have 40:1 gearboxes and the Weaver T1 4-4-4-4 with a whopping 72:1 gearbox. That one does have some motor whine, as would be expected.
This model does not have Engineer on Board, as the photos show no sensor or stripes on the flywheel. I suspect the motor itself could be making that racket. You could loosen the motor mount screws, loosen the small Allen screw that secures the flywheel, slide the flywheel off the shaft (this takes pressure from 2 screwdrivers to pry it forward) and test the motor by itself.
