Zig zag (railway) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Zig zag (railway)" in English language version.

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books.google.com

Raymond, William G. (1912). "Railway Engineering" (Google books). In Beach, Frederick Converse (ed.). The Americana: A Universal Reference Library, Comprising the Arts and Sciences, Literature, History, Biography, Geography, Commerce, Etc., of the World. Vol. 17. New York: Scientific American Compiling Department. Retrieved 3 January 2010. High mountain levels … may be tunneled … but … may be reached by one of several methods adopted to secure practical grades: (1) Zig-zag development … (2) Switchback development … (3) Spirals or loops …

"Historical and Archaeological Assessment of Proposed Cycleway, Near Thornleigh Quarry, Via De Saxe Close, Thornleigh (Berowra Valley Regional Park), N.S.W." (PDF). The construction of the railway siding and zig-zag to the quarry and also Hall’s Camp were associated with Amos & Co, who won the contract to build the section of railway from Strathfield to Hawkesbury River. Edward Higginbotham & Associates PTY LTD. March 2002. Retrieved 19 November 2017.

"The Zig-Zag Deviation". The Dubbo Liberal and Macquarie Advocate (NSW : 1892–1927). NSW: National Library of Australia. 5 December 1908. p. 4. Retrieved 17 February 2013.
"The Railway Accident on the Zig-zag". Bathurst Free Press and Mining Journal (NSW : 1851–1904). NSW: National Library of Australia. 10 April 1895. p. 3. Retrieved 19 February 2013.

Callwell, Robert (September 1999). "Transit in San Francisco: A Selected Chronology, 1850–1995" (PDF). San Francisco Municipal Railway. p. 90.

"Mountain Railways of India". UNESCO World Heritage Centre. Retrieved 30 April 2006.