From the “Further Readings” section at the back of Paul Collin’s wonderful Banvard’s Folly: Thirteen Tales of People Who Didn’t Change The World:
There is one very simple way to see what Beach’s railway [19th century New York's secret, unfinished pneumatic subway] looked like, and blown up far larger than any plate in this book could manage. Go to a Subway shop–the fast-food chain, you know, where you can buy a six-inch Cold Cut Trio?–and lo! Pasted upon the walls are pictures of Beach’s invention. Whoever was designing the chainwide decor for Subway simply clipped out a bunch of old public-domain illustrations of subways, including three that originally ran in Scientific American in the 1870s. Look for the pictures that depict an almost perfectly round (save for a slight groove in the bottom) brick-lined subway tunnel, and a rounded subway car interior. These are Beach’s own handpicked illustrations for what was to be an ultra-million-dollar venture. Graze pensively on your Baked Lay’s Sour Cream and Onion chips. Ponder the vagaries of ambition.