In order to add-on to this reversing track system to you necessarily need to use the auto-reversing E-Z track items 44547 & 44548? .....page 142 in Bachmann catalog.
Yes you do, they have additional wiring under the rails.
The kit for the reversing point to point track has 4 auto-reversing E-Z tracks & 2 standard E-Z track? item 44547 page 142. So, why is add-on track need to be auto-reversing?
The two standard tracks are included to catch the trolley at each end and prevent it from crashing into the bumpers. You can add regular tracks to the ends to hold a longer train, but the locomotive won't go beyond the reversing tracks.