Billionaire entrepreneur Elon Musk has unveiled plans for a futuristic "Hyperloop" transport system. The hope is to whisk passengers between San Francisco and Los Angeles in less than half an hour.

The Hyperloop -- has been described as a cross between a Concorde, rail gun and air-hockey table. It will be solar powered and move passengers and even cars at speeds of up to 800 miles per hour.

The system's aluminum capsules would run above ground and along low pressure steel tubes.

Musk is now asking the public for help in improving the design.

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