Thank you to everyone who offered suggestions in response to my inquiry 
about the formula for railroad pills. I suspect that Ed Hale's suggestion 
that they were for motion sickness may be the answer.
   Since some people responded to me offlist, I would like to share with 
everyone the helpful resources they offered:

Medical resources:

http://www.nlm.nih.gov/hmd/
National Library of Medicine
History of Medicine page

http://www.mc.vanderbilt.edu/biolib/hc/nostrums/

American Medical Association Archives
http://www.ama-assn.org/ama/pub/category/1938.html

The FDA
http://www.fda.gov/oc/history/resourceguide/office.html


Railroad resources:

National Railroad Museum (Green Bay, Wisc)
http://www.nationalrrmuseum.org/

Railroad Museum of Pennsylvania (Strasburg, PA)
http://www.rrmuseumpa.org/

The University of Connecticut/NHRHTA Inc. Joint Railroad Archives
http://www.nhrhta.org/htdocs/uconn.htm

California State Railroad Museum in Sacramento
http://www.csrmf.org/contact.asp

Many thanks for the kind help!
Lynne

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