Mark Twain lectured three times at Rondout, New York (that I'm aware of). To reach that town he would have needed to take the Hudson River Railroad to Rhinebeck, then a ferry boat across the Hudson River to Rondout. I was curious about this ferry service and contacted the Hudson River Maritime Museum. Carla Lesh, the Collections Manager and Archivist was helpful in sending me an article on the history of this ferry. I have summarized the salient points, in regards to Twain's use of this ferry, in my entry on Rondout, NY: http://twainsgeography.com/location/rondout-new-york -- /Unaffiliated Geographer and Twain aficionado/