You can add as many terminal tracks as you need. Put one every 4-5 feet of track to get good power distribution, and use a heavy gauge wire to run the feeders to them.
Make sure the track is clean, and the pins on the track ends are making good contact to the next track to minimize power losses.
You should upgrade your transformer to a CW-80, if not a CW-180. You can never have too much power.
Larry