The town near us includes the largest railroad frieght car repair facility in the USA. Some are heavy mechanical rebuilds, some are new RR cars built from parts and some are repaints. Many needing paint have so much graffiti that the bar codes and ID numbers are obscured. A few have graffiti that shows off the talent of the artist and we get to see them while driving down Main Street.
Here is an auto transport RR car with a 12 foot Bart Simpson graphic. Wish I could connect these graffiti artists with a job in advertising, fine art or something lasting and productive.