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:

/Unaffiliated Geographer and Twain aficionado/