The inspection lights on the trucks is a very eye-catching detail!
I agree.
Key does it all. Unlike a steam engine that has a lot visuals, model diesels would benefit from proper lighting. Key incorporates that with their models. I don't understand why other O manufacturers like Atlas, MTH, and even Lionel don't step up and produce better lighting. They could start with the headlights and work their way back. Lionel once produced a warning/mars and dual sealed beam in the door F unit. The lenses were so bad that I didn't realize it had dual sealed beams in the door for 2 years.
BTW - I never hear may complaints/requests for better lighting in either the 3 or 2 rail community. I find it hard to believe that only those purchasing Key priced engines, care about proper lighting.