Hyperloop One ceased operations in December 2023, notes CNN. “Yet nearly two years on, in other parts of the world, hyperloop projects are ongoing.” For example, Rotterdam-based Hardt Hyperloop has a cool web site — and the company’s managing director tells CNN that hyperloops are the only “actionable, sustainable solution to replace short-haul air travel” over distances greater than 300 miles. “It’s 90% more efficient than air travel, operational expenses and…