At one time, I had heard the FWRHS had a lease on the N&W water tank for 7 years, but they do have their own water tank in New Haven that the 765 used to always travel with. At one time, there was work being done on getting that one roadworthy again.
Have also heard rumors that the N&W one will go back with 611 when the restoration is done.
Truthfully, the way NS seems to try not to piggyback operations, if one wanted to go to the trouble, you could probably alternate the tank between the 765 and 611 operating dates with a little bit of careful planning.
Not sure about the tool car. I was under the impression that they would just use the N&W-painted one that has been with 630 for the past couple of years.
Kevin