Ok, I think I've figured out how they could do this.
First of all, the trains would probably not be trains in the usual sense but trams that would run on street tires.
I'm envisioning something like an articulated bus with heavy exterior theming and similar theming at the station to disguise its wheels.
Put some mid-frequency transducers in the floor and it shouldn't be too hard to simulate a train moving along the rails.
I would imagine that the corridor needed to make a King-Kong type experience would be far too wide to utilize the entire way.
BUT,
Perhaps the shades on the windows would need to be drawn down (automated, motorized) and the guests' attention focused on something else during the bulk of the train's physical travel, like the chocolate trolley or whatever, or live actors inside the train.
Heck, you could have multiple 3-d projection stations that begin and end the ride, with most of it spent with the shades drawn and other things going on...
So, could go something like this-
1. Board the train at Studios "Kings Cross, 9 3/4" station, shades are up you can look out normally-
Train moves forward into a 3d-projection area and "peaceful, English countryside" video is played.
2. Shades are drawn, candy trolley comes down the aisle selling stuff. Audio or live actors do atmospheric stuff. Ride vehicle makes 99% of the physical journey to Islands.
3. Train/Tram enters second 3D-booth, shades raised, dementor attack or whatever is shown. Could have variable light conditions built into the projection to make it more seemless. Probably the more exciting of the two projection areas.
4. Shades still raised, train pulls into Islands station and guests disembark.
So what do we think? Feasible?
