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.