The first animated scenery item for Eastleigh is the yard access gate: this should open to allow trains in and out, but be closed otherwise. The plausible location for the gate isn't ideal: its edge will necessarily be very close to the edge of the lifting section. But the means of control is clear: a servo with a vertical shaft.
The servo itself was simple. Plastic blocks (B&Q furniture corner blocks, modified) were used to mount the servo under the lifting baseboard section. A metal shaft was inserted into the hole on the servo spindle - normally that hole takes a screw to secure the cam. the shaft of a flat-bladed jewellers' screwdriver turned out to be a perfect fit. With a vertical hole drilled from above, we were able to mount the servo with its spindle vertical and not binding on the edges of the hole.
The gate was made from brass tube: approx 1.5mm and 3mm diameters. An upright tube was crimped, so that it fits around the end of the screwdriver; that meant it would be turned by the servo but could be lifted off. Then the smaller tube was measured and bent into a deep "U" shape. We were able to drill the larger tube so the smaller tube would fit into it; the joints were then soldered. A brass cross-piece completed the frame of the gate.
I have some nylon mesh that makes a passable chainlink fence to be added over the top.
The next challenge was controlling the gate. An MSC8 Scenery Animator was the obvious choice; I will need other outputs from it for other things in the yard. Output 2 was programmed to be a servo output (CV10=4; CV54=70; CV55=210; CV56&57=0; CV58=0; CV59=10; CV60=64).
Finally Traincontroller has been programmed to operate the gate as part of the routes into the yard. A switch needs to be added to a switchboard, then it can be operated by the route being activated and deactivated.
And from the point of view of an operating gate, that's it. Scenic detail is all that needs to be added.