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That's pretty cool - Fleischmann offer something similar in HO and N scale at the moment so the idea must have merit. You could try soaking the sponges in medical alcohol (or whatever your preferred liquid cleaner is) then giving it a try - oiling the bearings on the motor and cleaning the commutator shaft would probably help. If the track pickup isn't that reliable you could remove it (looks as though the brass shoes on the axles should unclip) and use a rechargable 9v battery instead (simple circuit with switch, hide under styrene extension to the red bodywork). This would result in the sponges spinning rapidly regardless of the track voltage. Could also rig something up to deliver fluid to the sponges. Just a few ideas!
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