That "squeal" in your video sounds a lot like dry steel-on-steel to me. Look for any steel-on-steel joints, like maybe the front guide axle on the loco, or maybe something on the tender trucks, such as NICKAIX suggests or other. I'm guessing it most likely involves an axle somewhere. Try a tiny drop of oil on any steel-on-steel joint you find, and see if that cures the squeal. If not, have to start scrutinizing closer until you find it and cure it with a drop of oil or grease.
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