South Hills Junction is the most complex trackage
area on the "T," and indeed is one of the most intriguing junctions
on any of the country's light rail systems. Routes merge and
diverge both to the north and to the south of the station; this view
shows a portion of the involved trackwork to the north.
Despite all the
possibilities, the great majority of trains operate on the
upper and lower left legs.
The train in view has just left the inbound station from which this
photo was taken, and will
shortly be in the Mt. Washington tunnel. The busway, which
will join up for tunnel access, is visible to the left.