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If the burner energy source has a burnt results inventory set up, these appear to the right of the progress bar (minor issue: with different horizontal spacing to the fuel slots):
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The problem is that with locomotive GUIs there is not enough space to have both the required number of burnt result fuel slots and also an emissions multiplier, because the emissions multiplier text distorts the entire GUI, stretching out the inventory pane below:
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If vehicle fuels have a burnt result then the vehicle needs to have enough slots to cope with all the burnt results, or trains will grind to a halt before they are able to consume all of their fuel, because there is nowhere for the burnt results to go.
Currently modders have to choose one of the following workarounds:
1. Don't ever use both burnt results and emissions modifiers in locomotive fuels, possibly greatly restricting the fuels that locomotives can use.
2. Restrict locomotives to a smaller number of slots in total (the GUI can cope with up to 2 fuel and 2 burnt slots), putting a new limit on maximum train distances before refuelling.
3. Mess about with stack sizes, restricting yourself to a situation where burnt results always have 3x the stack size of the fuel.
4. Live with the broken GUI.
Suggested solution: remove the pollution modifier text shown below the progress bar. It doesn't need to be there: the modifier is already shown on the entity tooltip. In the case of vehicles, no vanilla vehicle or locomotive's energy source has non-zero emissions in the first place, so the emissions modifier doesn't have any effect on them anyway - it especially doesn't need to be displayed when it isn't having any effect.
