Hamilton American Classic Railroad Automatic Chronograph H40686335 Mens WatchHamilton American Classic Railroad Automatic Chronograph H40686335 Men's Watch The Rail Road series is a comparatively newer addition to Hamiltons line of classic watches and takes the brand back to its proud roots; to the era when Hamilton was given the honor of maintaining railroad accuracy. However, the classic style is full of everything that makes for a modern day watch, its olden charm and elegance blended with cutting edge technology.