Track gauge (English Wikipedia)

Sambu, Zeddy (29 April 2008). "East Africa: Countries Move to Upgrade Railway Network". Business Daily (South Africa). Archived from the original on 14 May 2014. Retrieved 13 May 2014.

allafrica.com

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"Colombia and Venezuela to build railroad". Archived from the original on 25 March 2012. Retrieved 27 May 2011.

Siddall, William (January 1969). "Railroad Gauges and Spatial Interaction". Geographical Review. 59 (1). American Geographical Society: 36. doi:10.2307/213081. JSTOR 213081.

Heywood, A.P. (1974) [1881, Derby: Bemrose]. Minimum Gauge Railways. Turntable Enterprises. ISBN 0-902844-26-1.

Siddall, William (January 1969). "Railroad Gauges and Spatial Interaction". Geographical Review. 59 (1). American Geographical Society: 36. doi:10.2307/213081. JSTOR 213081.

"Beyond Thunderdome: Iron Curtain 2k6". Archived from the original on 8 July 2011. Retrieved 10 October 2007.

"TOY RAILWAY". The Northern Standard. Darwin, NT: National Library of Australia. 8 December 1939. p. 15. Retrieved 5 December 2011.

"An Act for regulating the Gauge of Railways" (PDF). 18 October 1846. Retrieved 26 April 2010.

Alberto García Álvarez, "Automatic Gauge Changeover for Trains in Spain" (PDF), Fundación de los Ferrocarrilos Españoles, 2010.

"Beyond Thunderdome: Iron Curtain 2k6". Archived from the original on 8 July 2011. Retrieved 10 October 2007.
"Experience and results of operation the SUW 2000 system in traffic corridors" (PDF). Archived from the original (PDF) on 19 March 2009. Retrieved 7 December 2008.
"Track Safety Standards Compliance Manual Chapter 5 Track Safety Standards Classes 1 through 5" (PDF). Federal Railroad Administration. Archived from the original (PDF) on 28 May 2008. Retrieved 26 February 2010.
Estonian railways today Archived March 3, 2016, at the Wayback Machine, p. 32
"Colombia and Venezuela to build railroad". Archived from the original on 25 March 2012. Retrieved 27 May 2011.
"Venezuela, Argentina begin construction of railway linking their capitals". China Daily. Xinhua. 21 August 2008. Archived from the original on 4 March 2009. Retrieved 21 August 2008.
Sambu, Zeddy (29 April 2008). "East Africa: Countries Move to Upgrade Railway Network". Business Daily (South Africa). Archived from the original on 14 May 2014. Retrieved 13 May 2014.

"Venezuela, Argentina begin construction of railway linking their capitals". China Daily. Xinhua. 21 August 2008. Archived from the original on 4 March 2009. Retrieved 21 August 2008.