Streamline Memories Blog found a 1958 Union Pacific coloring book that hasn't ever been used, and scanned it so you can flip out over the way things used to be, 70 years ago

http://streamlinermemories.info/UP/UP58ColoringBook.pdf  for the whole thing
http://streamlinermemories.info/?p=12611

they have several other coloring books from the 50s and 60s on this blog.