Many of us have seen some neat Custom trains for sale on Ebay and wondered how they were done. Here is the YouTube Channel for that seller Custom Trackmaster. There are also Tutorials on gear and motor repairs. A very nice and informative Channel.
https://www.youtube.com/channel/UCjgiP5S...D9g/videos
https://www.youtube.com/channel/UCjgiP5S...D9g/videos