How to stop the eyes from moving in Bachmann Thomas locos

Hi! The eye mechanism is part of the model's gearbox, so you would have to take the model apart to remove the gears that move the eyes. Unfortunately, I don't quite have any pictures of one at hand (I could show you how to take Thomas' gearbox apart), but tomorrow, I might be able to grab some pictures. I hope this at least helps a little bit, though!