Yea, without those casters, I would not be able to get around to the rear and left sides, and that is just not acceptable.
Again, thanks for all of the help.
The only thing that I have to, electrically, is to determine if I really need the Perpetual Barking Dog for the MTH Proto Sound locos, when parked on a blocked siding wile the track is continually powered, if it will wake up when the block is energized.
I have the 6 receivers boxes needed:
3 for control
3 for the PBD