Can't find another place to post this so I'll put it here and the moderators can move it to where it belongs.
My son-in-law gave me a book for Christmas and I just got to looking at it.
It's Trains - a complete history from Thunder Bay Press, authored by Philip Steele, copyright 2014
Here's the fun part: it has paper models of 50 trains from an 1804 Trevithick Pen Y Darrin (used in Welsh mines) and a Stephenson's Rocket, to a Japanese HD300 and maglev trains. Each has a brief history. They aren't accurate to the pictures of the real thing, but they might present a fairly interesting finished product. The UP Big Boy might be a real challenge.
They are easy to assemble, very colorful, and in various scales. One or two are even close to O. I wish I had a kid in my life to make these with, maybe for a school project or show-and-tell.