In this video, you’ll experience Japan’s “superconducting Maglev ‘Linear Motor Car’ train at 502 km/hour (312mph), on a beautiful day at JR Railway’s Technical Research facility”. Clip after the jump.
Due to the lack of physical contact between the track and the vehicle, the only friction exerted is that between the vehicles and the air. Consequently maglevs can potentially travel at very high speeds with reasonable energy consumption and noise levels
[via Wikipedia]