Thanks for the advice on troubleshooting Jim.

When I did the test w/ the multimeter, the Locomotive was off the tracks. I did the test with the speed control at 0 and at 100%. and directly on the track itself and the only movement I could get on any of the multimeter settings was the Ohm setting and on x1K and movement was negligible on either 0 or 100. I did not test the lead coming from the controller to the clip, but I did test the clip, and got nothing with pwr on and controller at 0 and 100. I also did not test the transformer with the meter, but the light on the controller burns bright. I would assume (like you) that if the controller is pwred up, then the transformer is working.

Is the circuit breaker in the train set in the transformer or the controller?

I notice that the wires (power leads??) inside the front 4 small wheels are really tiny and have kind of a crappy solder job. How can I test the locomotive off of the tracks to rule out the locomotive as the problem?

Thanks for the help y'all. Its a 90044 and a Big Hauler. North Pole Special. The train was only working for about 2 days last year and now not at all. The tracks and wheels are clean as a pin. No needles or dirt/grime. I checked the direction of the front wheels and they are fine too.

I plugged it up and tested the tracks with a GE2527 Multimeter and got no reading except on the "X1K ohm" setting and then it BARELY moved. Then I tested the clip that gets pwr to the tracks. Nada! The wall wart seems to be getting plenty of pwr to the controller, but not to the clip. Maybe a bad red cord from the controller to the tracks? Maybe a bad clip? More advice welcomed. Thanks in advance.

The train stopped working within a couple of days of use last Christmas. It was set up under the tree on carpet. Power light on the controller is on, and track is now set up on nice flat surface and seems to be done correctly. Nothing happens. No lights, sound, nothing. Frustrated. Ive assembled/disassembled 6 or 7 times thinking that Im not getting good contact, but still nothing.