Here's an old motor and ring and pinion setup that I ordered through the mail a few days ago. This setup in in its second car that I built back in the early 90's. Now I'm thinking of making a plastic frame for it using CAD and my little printer.
Anyway this motor and gear setup has an enjoyable memory for me. It was first put into a AMT 'Get Smart' Alpine that I would race against my friend on our combined Eldon tracks to make one big track. As long as we were on the track at the same time, this motor could keep up with his Eldon car for it drained all the amperage from the transformers. We even used both our transformers on the track to get more power since the Eldon tracks were a little underpowered anyway. I guess this is why I still order parts through the mail to build this little cars.