Design/planning a major part of the project. General wiring rule, if there is a question about the amp-draw, up-size the wire. #12 gauge wire, a good choice, my smaller layout, I used #14 ga. for track feeds. Switch/turnout wiring, was 18 ga, mostly because, I had a lot of multi-conduction, (at least 8 conductor), thermostat wire. Most modelers seem to prefer stranded, I like solid wire, an easier termination. A 500 ft. roll of single strand, or thermostat wire doesn't last long. IMO, Mike CT.
Sorry, 
Answer to the questions. There are (8) eight track circuits, fuses, (7.5 amps per track circuit), top left of picture.
