Automatic block signaling (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Automatic block signaling" in English language version.

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books.google.com

Report of the Interstate Commerce Commission on Block-Signal Systems and Appliances for the Automatic Control of Railroad Trains. Washington: Government Printing Office. 1907. Retrieved February 18, 2022.

espacenet.com

worldwide.espacenet.com

US 918539A, Samuel H. Harrington, "Automatic Block-Signal System", issued April 20, 1909, assigned to William C. Wilson

railfan.net

prr.railfan.net

CT-400 Rules for Conducting Transportation (PDF). Pennsylvania Railroad. April 25, 1965. p. 51.

rssb.co.uk

"SSP011 07-91 Controlled, Semi-Automatic and Automatic Colour Light Signals in TCB areas". RSSB.co.uk. Rail Safety and Standards Board. July 1, 1991. Retrieved February 21, 2022. (registration required)
"Sign AC03 Iss 1: Automatic Signal Sign and Identification Plate". RSSB.co.uk. Rail Safety and Standards Board. June 6, 2015. Retrieved February 21, 2022. (registration required)
"GKRT0064 Iss 1: Provision of Overlaps, Flank Protection and Trapping". RSSB.co.uk. Rail Safety and Standards Board. February 12, 2000. Retrieved February 18, 2022. (registration required)
"SSP020 05-78: Overlaps". RSSB.co.uk. Rail Safety and Standards Board. October 31, 2016. Retrieved February 18, 2022. (registration required)

trains.com

Gwyer, William L. (May 1, 2006). "Train Orders". Trains. Retrieved February 18, 2022.
Bryan, Frank W. (May 1, 2006). "Railroad's Traffic Control Systems". Trains. ABC's of Railroading. Kalmbach Media. Retrieved February 24, 2022.