Other countries that have had to upgrade their railway lines have come up with detailed research into the options available.
See research done in Spain
http://www.vialibre-ffe.com/pdf/Track_gauge_changeover.pdf
Australia dual gauge railway.
Switzerland rail
Wallangarra, Australia
Western Australia
The trans-continental passenger train Indian Pacific, which has run between Sydney and Perth since 1970, is seen on the dual gauge track (3’6″ and 4’8.5″ – 1067 mm and 1435 mm) between Kalgoorlie and Perth (655 km) in 1976, with the loco in the scheme of the then Westrail.
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