I help out in a model shop 1 or 2 days a week. The first issue of the model arrived and were tested and seem to run well, but one customer reported smoke coming from underneath the loco and a smell of burning. He took it off the track,but he hasn't contacted us since. We have now received a sound version of this last loco. I tested this loco using a b'mann basic e-z command controller. Switched everyone on but nothing happened, cleaned track and tried again, sound came on loco moved slightly then went dead. Took loco off track and cleaned wheels with isopropyl alcohol and cotton bud. This seemed to cure the problem, could it be that this loco is overlubricated?