Railroads and the Making of Modern America also links into the following railroad history sites for users to get more information and documentation on railroads and their histories (this list is by no means complete but seeks to provide access to the very best sites):
- Union Pacific Railroad: The Union Pacific site includes history on the line and links to current steam railroad operations, as well as information on the Union Pacific Railroad Museum in Council Bluffs, Iowa.
- Confederate Railroads: This site contains original documents from the National Archives, as well as newspapers and annual reports, on each of the Confederacy's railroads.
- Stanford University Spatial History Project: Professor Richard White and a team at Stanford University are developing a spatial analysis of California and transcontinental freight rates in the nineteenth century.
- UMR Geographie-cites (13 rue du Four, Paris): Anne Bretagnolle and her graduate students at the Paris One GIS lab have developed detailed historical models of railraod and urban development patterns in the U.S. and France in the nineteenth century.
- Library of Congress American Memory Railroad Maps: This site included hundreds of the Library's original maps of railroads and provided the base maps for our historical GIS work of the pre Civil War railroad network growth.
- Central Pacific Railroad Photographic History Museum: This site contains very useful and important resources on the development of the transcontinental railroad.
- The Railway and Locomotive Historical Society: This society publishes Railroad History, the leading journal in the field.
- Transcontinental Railroad: This PBS American Experience film and web site explores the building of the Union Pacific and Central Pacific railroads.
- Baltimore and Ohio Railroad Museum: This museum contains archives on one of the earliest railroads.
- National Railroad Musuem: The National Railroad Museum in Green Bay, Wisconsin, features exhibits on art, railroad workers, music, and oral history collections.
- The Durham Museum: The Durham in Omaha, Nebraska, is located in the old Union Station, includes exhibits on the Union Pacific and its history in Omaha.
- The Thomas J. Dodd Research Center, University of Connecticut: The Railroad History Archive includes company records for the major New England lines, especially the New York, New Haven, & Hartford, as well as an extensive list of railroad web site links.
- The National Railway Historical Society: This organization is the leading railway heritage society and organizes historical tours.
- Railroad Cartoons: An extensive collection of fascinating nineteenth-century cartoons about the railroads.
- The Newberry Library: Few libraries contain as much railroad history as the Newberry in Chicago. The archives of the Illinois Central and of the Chicago, Burlington, and Quincy are held there, as well as their subsidiaries and leased lines.
- The Hagley Museum and Library: The Hagley near Wilmington, Delaware, holds extensive railroad records and annual reports, especially for the mid-Atlantic and Pennsylvania region.