Jos, using some kind of putty might work if I get it thin enough and sraight enough so it looks like where the tracks ran.
B&S, I'm out of commision with a badly infected left hand and I have a hard enough time taking a decent picture when both hands are working.

This is a picture of a portion of the current street trackage:
I'd like to model a spur running off to the right down Central Avenue that would have served a warehouse down there but it's no longer in use. What I envision is the same type of concrete strip in the middle of the street but with the tracks paved over with asphalt. I'm just trying to figure out a way to do this without tearing up the existing brick steet but still make it look like an old street running spur.