Bob beat me to it - getting back to the OP question about shooting a layout with a drone. Most responses were referencing real trains.
I just looked at some indoor videos taking by a Xtreem QuadForce drone and a Cheerson X-30 drone, both relatively cheap and made to fly indoors. Not the greatest videos, but I think the Quadforce was stable enough to get decent layout shots. With practice you could easily follow along with your train. The larger the layout room, the better. Might work well in an arena setting at a train show (doubt the organizers would allow it).
So I think as the technology gets even better and drones get cheaper, drones videos of indoor layouts will become more common - may even have a separate OGR forum for it
