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I am a computer tech and tried this. Some of the problems have been addressed already. You need to us an AT style as an ATX style needs the mainboard to power up, not really, but it's too hard to get them to work without one. You will also need a constant load such as an 1157 lightbulb attached as most will not start and will shut down without a load. They will indeed melt wires, some put out 50 amps at 5 volts! Fuses cost too much in the long run. Try building a load limiter circuit, or a low tech way is to use an automotive headlight in series to limit the load in overload conditions. Another problem is they only output 12 volts. That really isn't enough to run locomotives at speed. It also won't run switch machine coils reliably. The cooling fan in them make noise, that bugged me after a while. They are good for powering lots of lights using a central power station. I found a better source of power were all the old wallpacks for old printers, modems, and speakers. They are low amp, quiet, cheap, and come in all voltages in DC and AC. They are what i use. As to didoe lighting, green, red, and yellow don't make good structure lights. First they are focused and not diffused. Second, other than a redlight district and bug bulbs where would they look right? Small ones make good signals, but for structure lights? Better source of cheap lights are white Xmas lights. After Xmas I bought 100 white lights for a $1 They ususally run on 2.2 volts each so put them in series to equal the voltage you use. They even come with sockets. I always run them a little low on voltage, 1 to 2 volts. They last forever that way. The lower the volts the dimmer and yellower they get. At about 1 volt they look like kerosine lamps. At 2 volts they look like regular lights. I use them in all my structures now. Lastly, if using wall pack, don't overload them. It's easy to do with lights and the packs will burnout and be trash. Another good thing about wall packs is it's easier to troubleshoot a small area when it goes dead than the whole layout.
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