Well said MEC407.
Daylight, I admire your enthusiasm and knowledge, but you are getting to the age where you need to start appreciating railroads for what they do, not because "trains are cool." Locomotives are powerful and awe inspiring but do serve a purpose. You might want to consider picking up some books about the business side of railroads. I would recommend "The Men Who Love Trains" to start. In fact, let me give you your first lesson.
Railroads paint locomotives for two reasons:
1) Public image. United Parcel Service (UPS) washes all their vehicles on a weekly basis. Rarely do you see a filthy truck as it reflects poorly on the company. They take care of their infrastructure which says to the customer, "We'll take care of your package." The same philosophy applies to railroads.
2) Long-term investment. A locomotive is a long-term investment, just like the car you drive. The better you take care of your car, the longer it will last. You also increase your "return on investment", meaning it pays for itself and then some. Paint prolongs the life of the locomotive. Of course, it is worthless if the mechanical components are not given the same treatment. Railroads, just like you, have to make financial decisions. Which would you rather have...a car that looks awesome and goes nowhere or one that isn't pretty but gets you where you need to go? I don't think a potential girlfriend wants to sit home on your parents couch watching the latest episode of "Glee."
As I said Daylight, you remind many of us on this board of ourselves at your age. The enthusiasm is so important but it is now time to direct it towards becoming a truly well-versed railroad historian. Also, you might want to start using capitalization.
"I'd rather be defated in a cause that will ultimately triumph than triumph in a cause that will ultimately be defeated."
I was partially raised by a pack (some wild) of railroaders.