Can Hyperloop travel at the speed of sound?

Hyperloop: the fifth mode of transportation, capable of travelling at the speed of sound. “It is basically a train travelling within an airless vacuum tube.



While the theoretical goal for Hyperloop technology is to approach supersonic speeds, it is designed to travel at "transonic" speeds—roughly 700 to 760 mph (1,100 to 1,200 km/h)—which is just below the speed of sound (Mach 1). The speed of sound is approximately 767 mph (1,234 km/h) at sea level, but it varies with temperature and pressure. To achieve these speeds, Hyperloop uses a "vactrain" concept: pods move through a sealed tube with a near-vacuum environment, virtually eliminating air resistance, and utilize magnetic levitation (Maglev) to remove friction from tracks. Traveling at the actual speed of sound would create "sonic booms" and complex shockwave issues within the tube (known as the Kantrowitz limit), which is why the current engineering target is usually around Mach 0.9. In 2026, while full-scale passenger loops are still in the testing and certification phases, the focus remains on subsonic speeds to ensure passenger comfort and structural safety during acceleration and deceleration.

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First imagined at least 100 years ago, it would basically look like some version of those green tubes on Futurama. Imaginary no longer, it would seem. If everything goes according to plan, Hyperloop One's pods will carry humans and cargo at 760 mph — 30 percent faster than a 747 airplane.

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Background on Maglev Train, Vactrain, Hyperloop They are even faster than regular maglev trains, but are even more expensive to build. Hyperloops are a proposed type of transportation that would use a low-pressure tube to send people or cargo through a tube at high speeds.

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Some argued the system would be pricier and require more energy than Musk had calculated, making the Hyperloop impractically expensive. Plus, California has already invested years and millions of dollars in a stalled attempt to build a normal high-speed train line for the same journey.

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Hyperloop refers to a Maglev train system where maglev “pods” run through evacuated tubes, removing air resistance and allowing for projected speeds of 750+ mph.

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Current rules prohibit commercial airplanes from flying at supersonic speeds over land because of the noise levels associated with sonic booms and the negative impacts to humans and animals.

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This technology is based on the concept of magnetic levitation, which uses magnets to suspend the pod and propel it forward. This makes the Hyperloop TT much faster than the bullet train, which has a maximum speed of 200-300 miles per hour. Both the Hyperloop TT and bullet train are designed with safety in mind.

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All it takes is one leaky seal or a small crack somewhere in the hundreds of miles of tube and the whole system stops working, Musk wrote in his initial Hyperloop report. Another technical problem centers on the pod moving through a tube containing air.

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If you have 10 tons per square metre pushing on the outside of the Hyperloop, and nothing pushing on the inside, there is a risk of a vacuum collapse - essentially the tube being crushed by the atmosphere, says Mason.

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