I mentioned that mine ran like a dog, well here os what I did to sort it. Pickups to all Drivers, a job that I may do to another recalcitrant 0-6-0 in my stud.
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8ba Screws were used with washers to help hold the wire that was only soldered to the outside screws. The next pic shows in close detail the brutality of the job. Certainly transformed the running as in effect only the outside wheels and the pickup sliders could be guaranteed to collect juice before the mods. Never enough in my experince for satisfactory running at slow sensible speeds in the Garden.
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She has not been out of the box since the Ruschbahn closed sadly. Something that ought to be remided. But those Rack Wheels will not turn as I have no rack left after I flogged it all at Glendale.