If you have decent connectivity for the pins, IMO every 10 inches is overkill. When I initially had most of my track down but no drops wired yet, I connected a PH180 brick to one end, and I was able to run trains on the whole 12 x 24 layout. This was with all new track and switches. Ross switches, some Ross O72 sectional track, and three cases of Gargraves flex track. Needless to say, I didn't plan on actually running that way, I just wanted to see how bad it would be, I was pleasantly surprised that it ran at all! Now I have 500 feet of track and a drop every 6-8 feet. I've never seen any voltage drop issue anywhere on the layout.
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