Photos of Aaron's elevated track
The track bed is made from 1 X 3's that were cut down to about 2 1/4" wide. The track sits on foam and is nailed to the wood in just a few places. There is a siding over the closet. Near the center is the 'shed' which consists of thin plexiglass bent over the track. It keeps the engine dust free when not in use.
We had some difficulty with attaching the bridge, so we decided to use some aluminum angle to attach it to both ends. It doesn't look the best, but it works.