Depending on how good ones vision is. Double check the tires.
If you can get your eyeball down by the railhead , using a flashlight if necessary and watch the "tired " wheel roll across the rail.
You'll see the metal part of the rim rise and fall in relation to tire thickness indicating an uneven or flat spotted tire.
Any loco that I've had wobbles from tires got better over run time, or after they sat on a shelf on the flanges when not in use.
These engines sit in the Styrofoam on the wheels for weeks or months before purchase flat spotting the tires.
