...some interesting notes on this locomotive...
The slipping problem it came with was a result of an ear clip breaking. It is used to hold the worm gear in line and in contact with the bull gear. This would hold until a load was applied, whereupon it would push up and out, disengaging the drive. By installing a cone spring that pushes down on the top of the worm gear housing, it keeps the gears engaged while retaining the drive axle's ability to flex and roll in motion...
The tender electrical connections are shear genius. At a time when models were not quite standardized, leaving locomotives wired to go in different directions because of polarity, Irv came up with a novel solution. By making the terminal ends interchangeable with a simple plug in socket installed in the tender body and frame, polarity--and therefore directional travel---could be correct, even if one took their new prize to another layout...
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