@Don Baird posted:I’m ready to install fuses on my O gauge layout Am I right to assume that they go on the bus lines A, B, C, & D, but not the common bus line (U)? on my ZW. I’m using 3 terminals for trains.
Correct. You may also want to see basic circuit protection at "Circuit Protection for Toy Trains".
That's where I shared my protection on a very large layout.