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First, 14 gauge wire works well in your circumstance. The reason I recommend this is that you can buy the wire contractors use in houses at Home Depot or the like and save some money. You will need to cut the outer protective off to get at the wire underneath it. I have done this - no big deal. Secondly, you used a dreaded term among some of us and that is - the "train set power pack". These are usually garbage. Thirdly, you had to know this was coming. If you are like me and your total knowledge of electricity is how to turn the kitchen light on and off, seriously consider going dcc as it will simplify your wiring, ten fold - even an electrically challenged individual such as myself could understand it. So you run two power buses (2 wires - different colours -14 gauge) under your layout. We will call the two wires - A and B. Now feeders go from your track to power bus wire. We will call each set of feeders - 1 and 2. So feeder 1 goes to bus wire A and feeder 2 goes to bus wire B. See I told you it is easy. You will come up with many recommendations for the distance between each feeder, but many are beginning to accept that every three feet is best for electrical and signal integrity. The wiring can get more complicated than what I just described at reversing loops, wye's, turntables, etc. But start out with what you can understand, then go from there. Buy "The Big Book of DCC". Read the first half of hit several times.
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