Recently i switched from rocket fuel to uranium fuel with my trains. At the fuel loading station i added a logistic box to get rid of the now unwanted rocket fuel and the usual request box now with the uranium fuel. An inserter removes with a filter just the unwanted rocket fuel and one inserter ...

I'm going to ask here before posting in the suggestions section in case this is something that can be worked around or is intended.

When setting up train interrupts for refueling the options to trigger the interrupt are "Fuel (All locomotives)" and "Fuel (Any locomotive)" then you get your item ...