Executive Summary: The Derailment of the Fifth Mode of Transport Updated May 2026 - The Hyperloop concept, based on entrepreneur Elon Musk's 2013 white paper, was presented as a revolutionary "fifth mode" of transportation promising near-supersonic ground travel. However, by the close of 2023, the sector had undergone a severe market correction marked by corporate failures and strategic retreats. The most significant player, Hyperloop One (formerly Virgin Hyperloop), declared bankruptcy and ceased operations at the end of December 2023, effectively ending the most heavily funded commercial effort. By early 2026, additional failures, including the bankruptcy of the Dutch startup Hardt Hyperloop and the insolvency and asset sale of Spain's Zeleros, confirmed that the collapse of the hyperloop sector is now essentially complete. This analysis confirms that the sector's decline was driven by two distinct types of market exit: (1) outright corporate liquidation and...