Hogwarts Express - anyone know how it works?

[Bairstow]

So I've heard conflicting stories about how the screens in the Hogwarts Express works.

The first reports I read said they were achieving glasses-less 3D by the use of a lenticular-lensed screen and carefully tuning the "lanes" to the rows of seats.

Now I've read it's just a normal screen with a bowl-shaped reflector on the ends.

Looking at them myself, I couldn't tell, since the 3D effect wasn't especially pronounced, though at one point I thought maybe it was a dual-layer screen- a transparent GWS LED screen overlayed on top of a higher-res 4K screen.

Anyone know for sure?

 

[kap91]

It's not really all that 3d. It's just a slightly curved screen that goes beyond the edges of the window. Any 3d effect just comes from the parallax effect (animating in a change of perspective - similar to Spider-Man). How exactly they manage to project on it I'm not sure, but I imagine it's rear projection of one kind or another.

 

[marni1971]

Mix of front and rear duel image 3D projection