I bought a Handcar with trailer, but realized why I got such a good price. Apparently there are two cracked plastic gears. One on the main drive and one on the pump lever. Both gears are on the axels. Does anybody make replacement gears since this item has been discontinued and Bachman does not? This is G scale.
Have you tried Northwest Short Line? They make gears of various sizes and may have what you need.
https://nwsl.com/