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I would assume those are the things you need.
We haven't done it yet, the set is only partially built as my husband is savoring it, but we intend to put a 9V motor in our HE. It may not happen for a while but I can let you know how it goes.
If you don't want to run both trains. You can just use the PF parts from #7939, which has everything you need.
PF does have those advantages. You can also set up PF and 9V track together as long as your 9V creates a completed loop. The PF train can go on the 9V and PF track, where the 9V trains have to stay to the 9V track. I have both types, and while I don't like the format of the PF pieces (too big), it's probably the better way to design a train set. They make for how real trains actually function, (the power source is in the train) and if you want to create crazy layouts you can do that with PF trains.