The tracks are glued directly onto the foamboard after the latter was painted flat black with latex paint. Fillmore can be generally described as flat, like most yards are. However, it is not truly flat; there is a slight variation in height in many places. For example, the two roundhouse inbound leads are about 1/8″ higher than the ready tracks/outbound lead. This was achieved with a Stanley Sure-Form rasp and 100 grit sand paper in a sanding block.
I believe that this variation is picked up by the eye and is worth doing. All tracks are PECO Streamline 83 flex track; they have fine detail. PECO No 6 and No 8 Electro-Frog turnouts are used; they have a very nice feature in an over-centre spring that keeps the switch points set when moved. To simplify things, the switch points are moved by finger (no switch machines or push-pull devices are needed). Frog Juicers are used to power the frogs (incidentally, I use PECO Insul-Frogs in staging). The tracks are airbrushed Testors Roof Brown acrylic overall, with a quick, random spray of thinned Reefer Grey onto the ties. Lacquer thinner applied to a cotton rag (old t-shirt) effectively removes the paint from the tops of the rails by rubbing with an index finger.
Ground cover is Woodland Scenics Fine Cinder Ballast liberally applied. Central Valley (non-working) switch stands complete the track work.