Does anyone know why a brand new loco would rock and wobble other than the wheels being out of quarter?
Is the engine spuddering in anyway, and is the wheels slipping at all?
Is it the Standard loco (with tender ) or the Spectrum Saddle Tank 0-6-0?
could have a driver miss drilled off center. That would sure cause it.
How is your track work? Do other locomotives also rock and roll?