Currently, there over 800 varieties of obsolete paper money known to have been issued by railroads in the United States, Canada and Mexico. If you are interested in this fascinating hobby, then please buy the book before buying the collectible.

General references

Bowers, Q. David, 2006, Obsolete Paper Money Issued in the United States 1782-1866: A Study and Appreciation for the Numismatist and Historian, (not a catalog).

Douglas, Duane D., Claudio Verrey, Alberto Hidalgo, ed. by Colin R. Bruce II, 1982, The Complete Encyclopedia of Mexican Paper Money, First Edition.

Gaytan, Carlos, 1972, Paper Currency of Mexico, 1822-1971.

Hoober, Richard T., 1983-1989, Railroad Notes and Scrip of the United states, the Confederate States and Canada. Perhaps the most valuable resources are a series of articles written by Richard Hoober in Paper Money, the bi-monthly publication of the Society of Paper Money Collectors. You may find installments of his articles in issue numbers 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 124, 125, 126, 127, 129, 130, 131, 132, 133, 135, 136, 139, 140, 141, 142, 143, 144.

Haxby, James, 1988, United States Obsolete Bank Notes, 1782-1866, Krause Publications. Huge four-volume set that typically sells for $750 to $1000.

Muscalus, John A., 1971, Railroad Currency: Bank Notes and Scrip Representative of Over One Hundred Railroads, 1830 to 1900s.

State references

Railroad currency is known from many states, but not all these references include railroad currency. You might want to borrow references that interest you to be sure.

Cassidy, Daniel G., 1980, The Illustrated History of Florida Paper Money.

Coulter, Mayre Burns, 1972, Vermont Obsolete Notes and Scrip.

Freeman, Harley L., 1967, Florida Obsolete Notes and Scrip.

Hewitt, R. Shawn, Charles C. Parrish, Steve Schroeder, Gilmore J. Sem, 2006, A History and Catalog of Minnesota Obsolete Bank Notes and Scrip

Hughes, Earl, 1998, Kentucky Obsolete Notes and Scrip.

Jones, Richard and Keith Littlefield, 1992, Virginia Obsolete Paper Money.

Legett, L. Chandler, 1975, Mississippi Obsolete Paper Money & Scrip.

Leggett, L. Candler, 1975, Mississippi Obsolete Paper Money and Scrip.

Krause, Chester L., 1994, Wisconsin Obsolete Bank Notes and Scrip.

Muscalus, John A., 1975, Georgia Railroad Currency Comprehensively Illustrated.

Rosene, Walter, Jr., 1984, Alabama Obsolete Notes and Scrip.

Sheheen, Austin Jr., 2004, South Carolina Obsolete Notes and Scrip.

Sheheen, Austin M. South Carolina obsolete notes: The first comprehensive listing of state, broken bank, town, city, railroad and miscellaneous other notes.

Wismer, David C., 1972, The Obsolete Bank Notes of New England.

Wismer, David C., 1983, Obsolete Banknotes of Ohio.

Wismer, David C., 1932, Old Paper Money in Ohio.

Wolka, Wendell A. Wolka, Jack M. Vorhies, Donald A. Schramm, 1978, Indiana Obsolete Notes and Scrip.

Wolka, Wendell, Ohio Obsolete Bank Notes & Scrip.

Wolka, Wendell, 2004, A History of Nineteenth Century Ohio Obsolete Bank Notes and Scrip.

Wolka, Wendell, 2006, A History of Nineteenth Century Ohio Obsolete Bank Notes and Scrip, 2005-06 Update (CD).