What rolling stock and/or vehicles would you like to see that haven't been made? I love historical research! Especially on topics that people don't normally learn about. I am also good with graphic design. I have even designed my own prototypically accurate decals for some models. I have already finished the decals and research but not design for the Boeing skybox. I would love to learn about some rolling stock or vehicles I didn't know about before. Currently pending research and design are:

A generic large lumber distributor

My current plan for my model railroad is a modern (current) era switching layout. I currently have two Athearn Genesis MP15AC locomotives that I am planning on using. Neither of these locomotives has ditch lights. They would be used strictly inside an industrial park setting, not crossing any "public" streets.  Would ditch lights be required in this type of setting? If so, how should I add them? I don't particularly care if they work or not. 

What preference do you prefer on using dull coat paint, shaker can or air brush and why  I read where some use Krylon 1310 dulling, but when reading Krylon literature it says wipes off .  Cans of Dull coat spray seems to go fast. $$   Thanks Zeke