If the tracked area is for trams/streetcars only, may I recommend that you make it green track?
Not only does it add much needed greenery to public spaces, but it also reduces heat at street level, reduces the running noise of trams and dramatically improves water drainage at street level. It even goes as far as reducing the damage to the tracks caused by the material expanding and buckling in high heat by simply keeping the rails cooler and better displacing heat.
It doesn't even have to be grass! Different species of plant, local species or hardier, low-maintenance species can be used, and furthermore, it tends to reduce maintenance costs of the tracks, as soil is easier to dig up than concrete or tarmac, and so the tracks can be accessed and worked on easier.
Obviously, if you want the street to be able to accept buses along with trams/streetcars, or other rubber-tyred vehicles, then a hard surface is necessary, but if it's light rail only, then green track gets my vote.