http://twainsgeography.com/content/three-speeches-tour-1871-72
I've attempted to plot the railroad lines traveled by Mark Twain on the
Three Speeches Tour. The routes plotted are from the KMZ files provided
by the University of Nebraska for 1870. The page linked to here has
links to pages for each of the months on the tour: October, November and
December of 1871 and January of 1872. The itinerary is from
http://www.twainquotes.com/SpeechIndex.html
The maps are interactive and you can zoom in as far as Google maps will
allow.