I hope it's okay post this here, but I bought the book Last Train to Paradise at Shell World in Key Largo earlier this year. If you love the Keys, like me, it is a fantastic, well-researched book about the construction of the first railroads in Florida which were headed up by Henry Flagler. This includes especially the "railroad that crossed the ocean" to Key West.. I promise you'll drive the overseas highway and view the old railway arches in a different light with a greater appreciation of the sacrifice and suffering that make this drive possible today.