Dual gauge (English Wikipedia)

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archive.today

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Álvarez, Alberto García (2010). Automatic track gauge changeover for trains in Spain (PDF) (4 ed.). Fundación de los Ferrocarriles Españoles. p. 7. ISBN 978-84-89649-56-9.

"South Australia's mixed gauge muddle" (PDF). Archived from the original (PDF) on 28 February 2016. Retrieved 8 November 2022.
"Arend onder Stoom – Het Spoorwegmuseum". www.spoorwegmuseum.nl. Archived from the original on 26 September 2020.
The length of Vietnam railway network Archived September 10, 2006, at the Wayback Machine

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Bakewell, Guy; Wilson, John (September 1968). "Farewell to Ellen Street". Australian Railway Historical Society Bulletin. XIX (371): 211. ISSN 0005-0105.
Buckland, J.L. (October 1962). "Bogie changing extends the benefits of standard-gauge". Australian Railway Historical Society Bulletin. XIII (300): 161–162. ISSN 0005-0105.
Buckland, J.L. (December 1955). "The "pick-a-back" train". Australian Railway Historical Society Bulletin. VI (218): 157–162. ISSN 0005-0105.

Harzquerbahn 2015 – Güterverkehr zwischen Unterberg und Nordhausen [Freight traffic between Unterberg and Nordhausen]. Schmalspurbahn-Fans. 2015. Retrieved 3 November 2022.