9. The Hyperloop
The Hyperloop may be the most ambitious of all of Musk’s brainchildren. It is a long-distance train (theoretically, it could span 930 miles) that uses air cushions and low pressure instead of tracks. Instead of sitting in train cars, travelers have their own pods.
This joint project between Tesla and SpaceX may sound even more bizarre than helping colonize Mars, but that may only be because nobody else thought of it first. The proposed route will go from Los Angeles to San Francisco. Musk has already called for developers to begin designing the pods and started work on the tunnel.