This folder contains correspondence pertaining to quadruplex and wireless telegraphy. Many of the documents deal with the organization and management of various domestic and foreign railway telegraph companies, including the Railway Train Telegraphy Co., the Railway Telegraph & Telephone Co., the International Railway Telegraph Co., the Consolidated Railway Telegraph Co., and the Consolidated International Railway Telegraph Co.

Approximately 80 percent of the documents have been selected. Meeting announcements and other routine documents of the various telegraph companies have not been selected.

Courtesy of Thomas Edison National Historical Park.