OK, so i put in a new light bulb in my lionel 1666 engine, the light worked fine and the engine ran for like 30 mins without any problems, then i saw some smoke come puff out the area of the e-unit. So i stopped the train, and tried to restart it, and it did nothing, i can't get it to run now, all i can get is, moving the e unit back and forth, the engine will click on, and the light comes on for like 1 second, or 2 second, then more smoke comes out from where the e-unit switch is. So could my e-unit have just burned out? if so how do i tell if the e-unit is bad? The light bulb i put in is 14 volts, I couldn't find a 12v lamp at radio shack, and the lionel instruction guide says the bulb should be 12 volts...I wouldn't think 2 volts difference would make the e-unit smoke, because it ran fine for 30 minutes. Any help to get it to run again? These old trains come with there problems.