I found my grandpa's Lionel 675, poor thing was probably wrapped in newspaper for near a decade now, it probably has old lubricant because it smells, I'm completely new to repair so
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Lionel O 6-62927 Lubrication and Maintenance Kit | ModelTrainStuff.com
671 Lionel Lines or Pennsylvania - Lionel Trains Library
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How to Care For O / O27 Trains and Equipment
Wonderful! - Model Train Journal
How to maintain Lionel trains - The Silicon Underground