The decision to add the class 40 in 2 variants for me, is making a real difference on top of the freight and abundance of traffic. I would propose that variants in headlight style and livery are a must for future loco releases. Even if on some licensed routes it was simply an approved vinyl overlay. (GWR).
Just need a split-box 40 now. There were also some with a centre box with square corners but maybe I should let that one slide.