I posted a bunch of these when I used to be on Drawger. I have a scrapbook full of them. They seem to be from the late 20's to late 30's. I think they would look great blown up as posters.
I bought a Japanese tin toy bullet train just like this one at a flea market on the weekend. It only cost me 20 dollars. You can buy the one pictured above for 300 dollars on Ebay. I love finding good junk at low prices.