and handed off the high-speed transport concept to the crowd, Elon Musk just can't help dabbling in the technology himself. The Tesla Motors and SpaceX CEO says he's going to try pushing a new pod design to half of the speed of sound and then slamming on the brakes. In a Saturday night tweet, Musk said an upgraded SpaceX/Tesla pod would be sped up to half of Mach 1, which is the speed of sound or about 767 mph (1,235 km/h), and then stopped, all within about three quarters of a mile (1.2 kilometers). That's like laying down a track that's about as long as four or five Manhattan city blocks and accelerating a vehicle down it until it reaches about 380 mph (612 km/h), then hoping you can slow it back down to a complete stop before it hits the end of the track. Upgraded SpaceX/Tesla Hyperloop pod speed test soon. Will try to reach half speed of sound (and brake) within ~1.2km.