...remember that if you painted your body bright yellow and ran around town yelling "Choo! Choo! I'm a train!" no one would think badly of you...

Shouldn't that be "...yelling "Honk! Honk! I'm a school bus!"? Trains tend toward blacks, grays and browns. Sure, they may have individual cars which are yellow, but that doesn't make the whole train yellow. Maybe they have all-yellow trains in some countries, but this is America, where we embrace multicolorism in our rail transport!