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A history of track gauge  by George W. Hilton (tidak lagi berfungsi)

— A list of railway gauges used or being used worldwide, including gauges that are obsolete.

European Railway Agency: 1520 mm systems  (issues with the participation of 1520/1524 mm gauge countries in the EU rail network)

The Indian Railways FAQ: Gauges

The Days they Changed the Gauge in the U.S. South

The myth that standard gauge derives from the specification for an Imperial Roman war chariot. (Urban Legends Reference Pages)