Update...
I have revisited the glued gear repairs I have done and notice that, even though the trains run fine with the glued gear, it sometimes slips on the split gear because that part is still a bit wider as even with the clamp it doesn't come perfectly together. Its annoying and I have had so many used trains that came in bulk purchases that had split cogs that I was running out of spare drive wheel assembly's. There had to be a better way. I have managed to remove one of the wheels and gear and tried Super gluing the gear off of the axle. I was able to glue it perfectly together but when sliding it back onto the shaft it would split again. I have now ordered (haven't received) this set of new gears from Yahoo Japan Auctions in hopes of a permanent fix. The one I took off was 12 tooth and I know I have come across some with 14 so I hope this works.
I have revisited the glued gear repairs I have done and notice that, even though the trains run fine with the glued gear, it sometimes slips on the split gear because that part is still a bit wider as even with the clamp it doesn't come perfectly together. Its annoying and I have had so many used trains that came in bulk purchases that had split cogs that I was running out of spare drive wheel assembly's. There had to be a better way. I have managed to remove one of the wheels and gear and tried Super gluing the gear off of the axle. I was able to glue it perfectly together but when sliding it back onto the shaft it would split again. I have now ordered (haven't received) this set of new gears from Yahoo Japan Auctions in hopes of a permanent fix. The one I took off was 12 tooth and I know I have come across some with 14 so I hope this works.