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[quote user="snjroy"] It sounds like a cracked gear or a gear jumping because something is blocking the drivetrain. If not the gear, it could be the side rods jamming. I don't have one of these, but you should be able to remove the boiler and operating it with the boiler off to see what is going on. If all is relatively normal without the boiler on (lack of weight will affect it), then something is blocking with the boiler on, like a loose wire. Simon   <div style="clear:both;"> </div> [/quote] Its not either of those things.  Once the combination motor and worm gear is removed, the chasis rolls freely. I discovered that it is a known problem with the 2006 run of K-27s.  The factory basically filled the motor with oil. When I took the motor out an ran it on DC, I got a bright white flash and smoke from the motor as the oil was burned off at high speed. Im also replacing the wiring harness as a precaution because its made of magnet wire, and I know thats a failure point on this locomotive.
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