Given that the controls for Thomas and Diesel are simple would it be too far a stretch to be able to control them from either Annie or clarabell adding a new perspective to the service. It's probably past time that a passenger camera option was added, i don't doubt such an option would be simple to implement but it'd nice to be inside a coach or carriage of the train the player controls and be able to see the suspension physics from a different perspective.
In the original.books, Thomas is implied to be a push-pull when hooked up to Annie and Clarabel. Would very cool to replicate that.
