I don't know if there is any way to model realistic turnouts in pavement, unless the traction guys have some sort of turnout that I'm not aware of. The problem is that our switch points move a much greater distance proportionately than the prototype. That is because even when modeling to finescale standards in ho scale or smaller our wheel flanges are wider than prototype. We also need to have a little extra clearance because of the possibility of electrical shorts. The closest that you could do would be to cut a "curved triangular" piece of styrene to fit between the points on one end and the frog at the other end. Then use somesort of fillerlike spackle or perhaps wet or dry sandpaper to simulate the texture of asphalt. This piece would then move with the points, so it would look prototypical only when the switch is thrown in either direction. It would not look prototypical when the switch is being thrown because the asphalt would move with the switch. At the frog end of the turnout, you would bring the road up to the outside edges of the frog while leaving the flangeways clear. Track would be done the same way, with the asphalt coming right up to the outside edge of the track, even to the point of touching the outside of the rail but lower than the top of the rail so it doesn't lift wheels off the rail and interupt electrical power to the trains. The asphalt in the middle of the track needs to have flangeway clearance for the wheel flanges. In fact Robert Smaus did a number of articals for RMC a few years ago on his model railroad which is a switching layout based on the "Gump Stump" layout in Kalmbach's "101 Track Plans For Model Railroads." He specifically mentioned that while he trys to model downtown Los Angeles on the S.P. in the early 50's, he deliberately made sure all of his turnouts were off the pavement in the dirt.
