Need a little help from the community on how to repair my old #Lego
train set from a kid. The insulation in the wire has gotten old and is falling off. Normally I would take it apart and replace the wire but I don’t think it’s an option.

Here’s the part number on brick link. https://www.bricklink.com/v2/catalog/catalogitem.page?P=5306c01&idColor=10#T=C&C=10
Emily linked this great thread in our DMs. https://www.eurobricks.com/forum/index.php?/forums/topic/169489-frayed-wiring-on-9v-track-connectors/