I assume the Lionel peel and stick LED lights, #1929904, connect to aux AC power 9-14v. Do they require resistors?
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Peel and Stick LED Lights 4-Pack
According to Lionel, 12-18 volts. Since they show them being connected to track, I can only assume it's A/C. There's also a video that explains it. Since the presenter didn't realize that there was AC on the track and tried to explain polarity, it's probably best to ignore the video. 
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Thanks John. Do you have any suggestions for supplementing building lighting with LEDS under canopies, in store front windows, and on the outside of buildings on signs? I have two DC wall warts, 9v 250ma and 12v 1a, I can use if it would eliminate the need for resistors on any nonLionel LEDS.
You need resistors on pretty much any LED with a fixed voltage power supply. LEDs are current mode devices, and the power curve bends very sharply once you reach their operating voltage. If you have a typical white LED that operates at 3.2 volts, it will draw 20 milliamps at that voltage. Just increase the voltage a couple of tenths of a volt and it's drawing double that current and it's lifespan is cut to probably 1/10 or even less.
Good information, thanks again.
