A work project and first full GR build. A small row house backyard down in the Capitol Hill neighborhood of Washington, DC that was totally concrete. Concrete busted into blocks (some of it 10" thick! Oy, my aching back!) and used for the back retaining wall and fill for a raised bed. Rest of the bed constructed of Xpotential timbers (recycled from all the non metal parts of cars). All the track laid on Tufboard ladder. Track is AMS code 332 (or whatever it is) brass flex. Two simple loops of about 5 - 7 foot diameter each with a siding. All will be battery powered.