I like to have just one commodity for each railcar. I've always been able to clone a car and remove all the commodities but one, by editing the config. In 2019 I cannot do this! I get a wrong kuid message when I try to save. Other than removing reference to the unused commodites all I do is make change to the name by added say two letter code to the end of the name. I don't want to upload the item, just use it on my own computer. I use Instant Load command and having one commodity I know that the car has the product needed when it reaches the delivery location.
Rob
Rob