"The National Power Traction Laboratory of Southwest Jiaotong University is developing a vactrain, or a maglev train that runs through in an airless tunnel, allowing it to run at speeds of 600 kilometers to 1,000 kilometers per hour, Beijing Times reported."
From: http://www.china.org.cn/china/2010-08/02/content_20624621.htm
Also see:
Trans-Atlantic Maglev Train:
Norway has studied neutrally buoyant tunnels (concluding that they’re feasible, though expensive), and Shanghai is running maglev trains to its airport. But supersonic speeds require another critical step: eliminating the air—and therefore air friction—from the train’s path. A vacuum would also save the tunnel from the destructive effects of a sonic boom, which, unchecked, could potentially rip the tunnel apart
...Then air would be pumped out, creating a vacuum, and alternating magnetic pulses would propel a magnetically levitated train capable of speeds up to 4,000 mph across the pond in an hour...
From: http://www.popsci.com/scitech/article/2004-04/trans-atlantic-maglev
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