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It will wear out, and you wont go a mile before something smells like its burning. Just no.
so can I basically control my layout with a constant current source, a radio frequency driven mosfet inside each train and an arduino controlled "base"
Under table LED lighting (w...View Instructable »
all I can say is make sure all LEDs work, the voltage is about 5.5 volts and that the data wire isn't corrupted anywhere. Any of these can cause the LEDs to freak out like that.
you can't use regular rgb leds, the construction will not come out the same. You could try the ws2811 LEDs, or those APA106, but they all function about the same. Here's and eBay listing:http://www.ebay.com/itm/WS2811-APA106-P9823-F5-5mm-F8-8mm-Round-RGB-LED-chipset-Full-color-LED-Chip-5V-/262557174771?var=&hash=item3d21a08bf3:m:m8T47ldvZXsC047otS-x2Jw
for a mega, just use the same data pin and analog pin, and set the programmer to arduino mega. Everything else is the same.
you can use a regular power supply, make sure it can deliver the right amps. But do not use just the USB plug, that would lead to overdischarge.
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