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=== Proposed Technology Enhancements ===
==== Evacuated tubes ====
{{Main|Vactrain, Hyperloop}}
Some systems (notably the [[Swissmetro]] system) propose the use of vactrains—maglev train technology used in evacuated (airless) tubes, which removes [[air drag]]. This has the potential to increase speed and efficiency greatly, as most of the energy for conventional maglev trains is lost to aerodynamic drag.<ref name=popsci>{{cite web |url=http://www.popsci.com/scitech/article/2004-04/trans-atlantic-maglev |title=Trans-Atlantic MagLev |access-date=1 September 2009}}</ref>
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