Train Location #8. The North Pole
Most likely a visual composition of multiple model train layouts, we will probably have to VFX this scene in the endless cavern that is the North Pole.
The North Pole is essentially an entire civilization underground, connected by train tracks throughout. This one could be build as a giant model, but pieces of it will have to be shot in real life, so the model would have to be built after the scene locations are picked – so they match.
Specific scenes at parts of the North Pole will have to be taken at various train layouts and full scale train locations.