Mike,

I don't think you need to worry about terminating your bus ends. For
one thing, you have relatively short runs - 10' in each direction.
Second, you are using Digitrax boosters which don't seem to exhibit
the problem other manufacturers have.

Still, it won't hurt if you add the terminations. Or for other
readers of this thread that have longer runs or other manufacturers'
equipment, here is a link to the section on adding terminations to
your buses: http://www.wiringfordcc.com/track_2.htm#c2

Allan