The Breitspurbahn (German pronunciation:[ˈbʁaɪtʃpuːɐ̯baːn], translation: broad-gauge railway) was a railway system planned and partly surveyed by the Nazi government of Germany. Its track gauge – the distance between the two running rails – was to be 3000 mm (9 ft 10+1⁄8 in), more than twice that of the 1435 mm (4 ft 8+1⁄2 in) standard gauge used in western Europe. The railway was intended initially to run between major cities of the Greater Germanic Reich (the regime's expanded Germany)[1] and neighbouring states.
^Puffert, Douglas J. (2009). Tracks across continents, paths through history: the economic dynamics of standardization in railway gauge. Chicago : University of Chicago Press. ISBN9780226685090. p 182