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Triang/Hornby XO4 motors can be replaced by 5 pole versions.I believe no longer in production but MRRC produced one as did another maker but I cannot remember the name.Have seen them at train fairs occasionally.
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Hi! Old Hornby 3 pole motors can be replaced by 5 pole versions if you can track them down.Major problem in good running is also likely to be the steel wheels on the older locos.
Regards.
John.