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I had never thought about that and you all may have a point about plastic wheels but:- 1/ Why only the Stainz? 2/ Why hasn't it happened before this, it has been running on this same track on MTS for 3 years. 3/ If i run my track cleaning loco over it, it still does it but not as much if the track is slightly dirtier. 4/ Why doesnt the powered tender have the same problem, it has a very similar set up regarding power pick up; could it be that the loco comes first and takes the brunt ot the problem? What if i run it around backwards and see what happens? 5? Electrolysis is one of my hobbyhorses and i suspect a capacitor has gone inside the loco and the arcs around the power pick ups are not being absorbed, this would cause an electrolytic action causing goo to be deposited on the pick ups; one much more than the other. If i was running on DC it would be all on one pick up instead of DCC. what do others think? Rgds Ian
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