There are several topics concerning adding weights. For example - https://ogrforum.ogaugerr.com/...0#152477233903365760
You will find it worth the the time to check the weight of all of your rolling stock and adjust the pieces that are underweight. All you need a small kitchen scale and some weights. A number of people, myself included, used wheel weights from Harbor Freight. They come in 1/4 and 1/2 ounce and they are self adhesive.