The AC4400CW tells you what % the automatic brakes are applied in the control tooltip, which I really like. Makes it easy to know how applied the brakes are from the outside. I just wish the GP38-2 and SD40-2 did the same thing. (Those only do the % on the independent brake.) You could possibly even apply that to the Class 66, maybe by adding the target brake pressure to the PBL handle tooltip (much like the way the slow speed control rocker works).